diff --git a/CHANGELOG.md b/CHANGELOG.md
index 56b6aff24..53070b80f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,9 +7,17 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## Unreleased
 
+### Fixed
+
+- Fixed crash when creating a `DirectoryTree` starting anywhere other than `.`
+- Fixed line drawing in `Tree` when `Tree.show_root` is `True` https://github.com/Textualize/textual/issues/2397
+- Fixed line drawing in `Tree` not marking branches as selected when first getting focus https://github.com/Textualize/textual/issues/2397
+
 ### Changed
 
 - The DataTable cursor is now scrolled into view when the cursor coordinate is changed programmatically https://github.com/Textualize/textual/issues/2459
+- run_worker exclusive parameter is now `False` by default https://github.com/Textualize/textual/pull/2470
+- Added `always_update` as an optional argument for `reactive.var`
 
 ## [0.23.0] - 2023-05-03
 
diff --git a/FAQ.md b/FAQ.md
index ffb91b1d7..c2b268c85 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -2,20 +2,22 @@
 <!-- Do not edit by hand! -->
 
 # Frequently Asked Questions
-- [Does Textual support images?](#does-textual-support-images)
-- [How can I fix ImportError cannot import name ComposeResult from textual.app ?](#how-can-i-fix-importerror-cannot-import-name-composeresult-from-textualapp-)
-- [How can I select and copy text in a Textual app?](#how-can-i-select-and-copy-text-in-a-textual-app)
-- [How can I set a translucent app background?](#how-can-i-set-a-translucent-app-background)
-- [How do I center a widget in a screen?](#how-do-i-center-a-widget-in-a-screen)
-- [How do I pass arguments to an app?](#how-do-i-pass-arguments-to-an-app)
-- [Why do some key combinations never make it to my app?](#why-do-some-key-combinations-never-make-it-to-my-app)
-- [Why doesn't Textual look good on macOS?](#why-doesn't-textual-look-good-on-macos)
-- [Why doesn't Textual support ANSI themes?](#why-doesn't-textual-support-ansi-themes)
+- [Frequently Asked Questions](#frequently-asked-questions)
+  - [Does Textual support images?](#does-textual-support-images)
+  - [How can I fix ImportError cannot import name ComposeResult from textual.app ?](#how-can-i-fix-importerror-cannot-import-name-composeresult-from-textualapp-)
+  - [How can I select and copy text in a Textual app?](#how-can-i-select-and-copy-text-in-a-textual-app)
+  - [How can I set a translucent app background?](#how-can-i-set-a-translucent-app-background)
+  - [How do I center a widget in a screen?](#how-do-i-center-a-widget-in-a-screen)
+  - [How do I pass arguments to an app?](#how-do-i-pass-arguments-to-an-app)
+  - [Why do some key combinations never make it to my app?](#why-do-some-key-combinations-never-make-it-to-my-app)
+  - [Why doesn't Textual look good on macOS?](#why-doesnt-textual-look-good-on-macos)
+  - [Why doesn't Textual support ANSI themes?](#why-doesnt-textual-support-ansi-themes)
+  - [Why doesn't the `DataTable` scroll programmatically?](#why-doesnt-the-datatable-scroll-programmatically)
 
 <a name="does-textual-support-images"></a>
 ## Does Textual support images?
 
-Textual doesn't have built in support for images yet, but it is on the [Roadmap](https://textual.textualize.io/roadmap/).
+Textual doesn't have built-in support for images yet, but it is on the [Roadmap](https://textual.textualize.io/roadmap/).
 
 See also the [rich-pixels](https://github.com/darrenburns/rich-pixels) project for a Rich renderable for images that works with Textual.
 
@@ -231,6 +233,13 @@ Textual has a design system which guarantees apps will be readable on all platfo
 
 There is currently a light and dark version of the design system, but more are planned. It will also be possible for users to customize the source colors on a per-app or per-system basis. This means that in the future you will be able to modify the core colors to blend in with your chosen terminal theme.
 
+<a name="why-doesn't-the-`datatable`-scroll-programmatically"></a>
+## Why doesn't the `DataTable` scroll programmatically?
+
+If scrolling in your `DataTable` is _apparently_ broken, it may be because your `DataTable` is using the default value of `height: auto`.
+This means that the table will be sized to fit its rows without scrolling, which may cause the *container* (typically the screen) to scroll.
+If you would like the table itself to scroll, set the height to something other than `auto`, like `100%`.
+
 <hr>
 
 Generated by [FAQtory](https://github.com/willmcgugan/faqtory)
diff --git a/docs/widgets/data_table.md b/docs/widgets/data_table.md
index 215d0541b..6d2100a26 100644
--- a/docs/widgets/data_table.md
+++ b/docs/widgets/data_table.md
@@ -59,9 +59,9 @@ If you want to change the table based solely on coordinates, you can use the [co
 
 ### Cursors
 
-The coordinate of the cursor is exposed via the `cursor_coordinate` reactive attribute.
+The coordinate of the cursor is exposed via the [`cursor_coordinate`][textual.widgets.DataTable.cursor_coordinate] reactive attribute.
 Three types of cursors are supported: `cell`, `row`, and `column`.
-Change the cursor type by assigning to the `cursor_type` reactive attribute.
+Change the cursor type by assigning to the [`cursor_type`][textual.widgets.DataTable.cursor_type] reactive attribute.
 
 === "Column Cursor"
 
diff --git a/questions/README.md b/questions/README.md
index bb201b128..f4b1f622d 100644
--- a/questions/README.md
+++ b/questions/README.md
@@ -5,13 +5,13 @@ Your questions should go in this directory.
 
 Question files should be named with the extension ".question.md".
 
-To build the faq, install [faqtory](https://github.com/willmcgugan/faqtory) if you haven't already:
+To build the FAQ, install [faqtory](https://github.com/willmcgugan/faqtory) if you haven't already:
 
 ```
 pip install faqtory
 ```
 
-The run the following from the top of the repository:
+Then run the following from the top of the repository:
 
 ```
 faqtory build
diff --git a/questions/datatable-doesnt-scroll.question.md b/questions/datatable-doesnt-scroll.question.md
new file mode 100644
index 000000000..7cd2ca296
--- /dev/null
+++ b/questions/datatable-doesnt-scroll.question.md
@@ -0,0 +1,10 @@
+---
+title: "Why doesn't the `DataTable` scroll programmatically?"
+alt_titles:
+  - "Scroll bindings from `DataTable` not working."
+  - "Datatable cursor goes off screen and doesn't scroll."
+---
+
+If scrolling in your `DataTable` is _apparently_ broken, it may be because your `DataTable` is using the default value of `height: auto`.
+This means that the table will be sized to fit its rows without scrolling, which may cause the *container* (typically the screen) to scroll.
+If you would like the table itself to scroll, set the height to something other than `auto`, like `100%`.
diff --git a/questions/images.question.md b/questions/images.question.md
index 6d86ea2f5..c6a1e3dc8 100644
--- a/questions/images.question.md
+++ b/questions/images.question.md
@@ -3,9 +3,8 @@ title: "Does Textual support images?"
 alt_titles:
   - "Can Textual display PNG / SVG files?"
   - "Render images"
-
 ---
 
-Textual doesn't have built in support for images yet, but it is on the [Roadmap](https://textual.textualize.io/roadmap/).
+Textual doesn't have built-in support for images yet, but it is on the [Roadmap](https://textual.textualize.io/roadmap/).
 
 See also the [rich-pixels](https://github.com/darrenburns/rich-pixels) project for a Rich renderable for images that works with Textual.
diff --git a/src/textual/dom.py b/src/textual/dom.py
index 3f549b059..1c8512f11 100644
--- a/src/textual/dom.py
+++ b/src/textual/dom.py
@@ -240,7 +240,7 @@ class DOMNode(MessagePump):
         description: str = "",
         exit_on_error: bool = True,
         start: bool = True,
-        exclusive: bool = True,
+        exclusive: bool = False,
     ) -> Worker[ResultType]:
         """Run work in a worker.
 
diff --git a/src/textual/reactive.py b/src/textual/reactive.py
index 08259200d..998d4079b 100644
--- a/src/textual/reactive.py
+++ b/src/textual/reactive.py
@@ -76,11 +76,13 @@ class Reactive(Generic[ReactiveType]):
     def var(
         cls,
         default: ReactiveType | Callable[[], ReactiveType],
+        always_update: bool = False,
     ) -> Reactive:
         """A reactive variable that doesn't update or layout.
 
         Args:
             default: A default value or callable that returns a default.
+            always_update: Call watchers even when the new value equals the old value.
 
         Returns:
             A Reactive descriptor.
@@ -326,18 +328,21 @@ class var(Reactive[ReactiveType]):
     Args:
         default: A default value or callable that returns a default.
         init: Call watchers on initialize (post mount).
+        always_update: Call watchers even when the new value equals the old value.
     """
 
     def __init__(
         self,
         default: ReactiveType | Callable[[], ReactiveType],
         init: bool = True,
+        always_update: bool = False,
     ) -> None:
         super().__init__(
             default,
             layout=False,
             repaint=False,
             init=init,
+            always_update=always_update,
         )
 
 
diff --git a/src/textual/types.py b/src/textual/types.py
index dd681f657..1b5d3ea25 100644
--- a/src/textual/types.py
+++ b/src/textual/types.py
@@ -7,11 +7,13 @@ from ._context import NoActiveAppError
 from ._types import CallbackType, MessageTarget, WatchCallbackType
 from .actions import ActionParseResult
 from .css.styles import RenderStyles
+from .widgets._data_table import CursorType
 
 __all__ = [
     "ActionParseResult",
     "Animatable",
     "CallbackType",
+    "CursorType",
     "EasingFunction",
     "MessageTarget",
     "NoActiveAppError",
diff --git a/src/textual/widgets/_data_table.py b/src/textual/widgets/_data_table.py
index 5991c98db..bbe07ebc6 100644
--- a/src/textual/widgets/_data_table.py
+++ b/src/textual/widgets/_data_table.py
@@ -38,6 +38,7 @@ CellCacheKey: TypeAlias = (
 LineCacheKey: TypeAlias = "tuple[int, int, int, int, Coordinate, Coordinate, Style, CursorType, bool, int, PseudoClasses]"
 RowCacheKey: TypeAlias = "tuple[RowKey, int, Style, Coordinate, Coordinate, CursorType, bool, bool, int, PseudoClasses]"
 CursorType = Literal["cell", "row", "column", "none"]
+"""The legal types of cursors for [`DataTable.cursor_type`][textual.widgets.DataTable.cursor_type]."""
 CellType = TypeVar("CellType")
 
 CELL_X_PADDING = 2
@@ -304,7 +305,8 @@ class DataTable(ScrollView, Generic[CellType], can_focus=True):
     zebra_stripes = Reactive(False)
     header_height = Reactive(1)
     show_cursor = Reactive(True)
-    cursor_type = Reactive("cell")
+    cursor_type: Reactive[CursorType] = Reactive[CursorType]("cell")
+    """The type of the cursor of the `DataTable`."""
 
     cursor_coordinate: Reactive[Coordinate] = Reactive(
         Coordinate(0, 0), repaint=False, always_update=True
@@ -312,6 +314,7 @@ class DataTable(ScrollView, Generic[CellType], can_focus=True):
     hover_coordinate: Reactive[Coordinate] = Reactive(
         Coordinate(0, 0), repaint=False, always_update=True
     )
+    """The coordinate of the `DataTable` that is being hovered."""
 
     class CellHighlighted(Message, bubble=True):
         """Posted when the cursor moves to highlight a new cell.
diff --git a/src/textual/widgets/_directory_tree.py b/src/textual/widgets/_directory_tree.py
index 0090717d7..b2a8ab692 100644
--- a/src/textual/widgets/_directory_tree.py
+++ b/src/textual/widgets/_directory_tree.py
@@ -103,7 +103,6 @@ class DirectoryTree(Tree[DirEntry]):
             classes: A space-separated list of classes, or None for no classes.
             disabled: Whether the directory tree is disabled or not.
         """
-        self.path = path
         super().__init__(
             str(path),
             data=DirEntry(Path(path)),
@@ -112,6 +111,7 @@ class DirectoryTree(Tree[DirEntry]):
             classes=classes,
             disabled=disabled,
         )
+        self.path = path
 
     def reload(self) -> None:
         """Reload the `DirectoryTree` contents."""
diff --git a/src/textual/widgets/_tree.py b/src/textual/widgets/_tree.py
index 91ffe794e..85255cf1e 100644
--- a/src/textual/widgets/_tree.py
+++ b/src/textual/widgets/_tree.py
@@ -429,7 +429,7 @@ class Tree(Generic[TreeDataType], ScrollView, can_focus=True):
     """Show the root of the tree."""
     hover_line = var(-1)
     """The line number under the mouse pointer, or -1 if not under the mouse pointer."""
-    cursor_line = var(-1)
+    cursor_line = var(-1, always_update=True)
     """The line with the cursor, or -1 if no cursor."""
     show_guides = reactive(True)
     """Enable display of tree guide lines."""
@@ -976,8 +976,8 @@ class Tree(Generic[TreeDataType], ScrollView, can_focus=True):
                 "tree--guides-selected", partial=True
             )
 
-            hover = self.root._hover
-            selected = self.root._selected and self.has_focus
+            hover = line.path[0]._hover
+            selected = line.path[0]._selected and self.has_focus
 
             def get_guides(style: Style) -> tuple[str, str, str, str]:
                 """Get the guide strings for a given style.
diff --git a/tests/toggles/test_checkbox.py b/tests/toggles/test_checkbox.py
index 573953f23..095f87485 100644
--- a/tests/toggles/test_checkbox.py
+++ b/tests/toggles/test_checkbox.py
@@ -15,7 +15,9 @@ class CheckboxApp(App[None]):
         yield Checkbox(value=True, id="cb3")
 
     def on_checkbox_changed(self, event: Checkbox.Changed) -> None:
-        self.events_received.append((event.checkbox.id, event.checkbox.value))
+        self.events_received.append(
+            (event.checkbox.id, event.checkbox.value, event.checkbox == event.control)
+        )
 
 
 async def test_checkbox_initial_state() -> None:
@@ -43,7 +45,7 @@ async def test_checkbox_toggle() -> None:
         ]
         await pilot.pause()
         assert pilot.app.events_received == [
-            ("cb1", True),
-            ("cb2", True),
-            ("cb3", False),
+            ("cb1", True, True),
+            ("cb2", True, True),
+            ("cb3", False, True),
         ]
diff --git a/tests/toggles/test_radiobutton.py b/tests/toggles/test_radiobutton.py
index dc32e8c0f..0dc4fda05 100644
--- a/tests/toggles/test_radiobutton.py
+++ b/tests/toggles/test_radiobutton.py
@@ -15,7 +15,13 @@ class RadioButtonApp(App[None]):
         yield RadioButton(value=True, id="rb3")
 
     def on_radio_button_changed(self, event: RadioButton.Changed) -> None:
-        self.events_received.append((event.radio_button.id, event.radio_button.value))
+        self.events_received.append(
+            (
+                event.radio_button.id,
+                event.radio_button.value,
+                event.radio_button == event.control,
+            )
+        )
 
 
 async def test_radio_button_initial_state() -> None:
@@ -51,7 +57,7 @@ async def test_radio_button_toggle() -> None:
         ]
         await pilot.pause()
         assert pilot.app.events_received == [
-            ("rb1", True),
-            ("rb2", True),
-            ("rb3", False),
+            ("rb1", True, True),
+            ("rb2", True, True),
+            ("rb3", False, True),
         ]
diff --git a/tests/toggles/test_radioset.py b/tests/toggles/test_radioset.py
index dc9de5b1b..95025bf37 100644
--- a/tests/toggles/test_radioset.py
+++ b/tests/toggles/test_radioset.py
@@ -11,7 +11,7 @@ class RadioSetApp(App[None]):
 
     def compose(self) -> ComposeResult:
         with RadioSet(id="from_buttons"):
-            yield RadioButton()
+            yield RadioButton(id="clickme")
             yield RadioButton()
             yield RadioButton(value=True)
         yield RadioSet("One", "True", "Three", id="from_strings")
@@ -36,6 +36,14 @@ async def test_radio_sets_initial_state():
         assert pilot.app.events_received == []
 
 
+async def test_click_sets_focus():
+    """Clicking within a radio set should set focus."""
+    async with RadioSetApp().run_test() as pilot:
+        assert pilot.app.screen.focused is None
+        await pilot.click("#clickme")
+        assert pilot.app.screen.focused == pilot.app.query_one("#from_buttons")
+
+
 async def test_radio_sets_toggle():
     """Test the status of the radio sets after they've been toggled."""
     async with RadioSetApp().run_test() as pilot:
@@ -52,17 +60,42 @@ async def test_radio_sets_toggle():
         ]
 
 
+async def test_radioset_same_button_mash():
+    """Mashing the same button should have no effect."""
+    async with RadioSetApp().run_test() as pilot:
+        assert pilot.app.query_one("#from_buttons", RadioSet).pressed_index == 2
+        pilot.app.query_one("#from_buttons", RadioSet)._nodes[2].toggle()
+        assert pilot.app.query_one("#from_buttons", RadioSet).pressed_index == 2
+        assert pilot.app.events_received == []
+
+
 async def test_radioset_inner_navigation():
     """Using the cursor keys should navigate between buttons in a set."""
     async with RadioSetApp().run_test() as pilot:
         assert pilot.app.screen.focused is None
         await pilot.press("tab")
-        for key, landing in (("down", 1), ("up", 0), ("right", 1), ("left", 0)):
+        for key, landing in (
+            ("down", 1),
+            ("up", 0),
+            ("right", 1),
+            ("left", 0),
+            ("up", 2),
+            ("down", 0),
+        ):
             await pilot.press(key, "enter")
             assert (
                 pilot.app.query_one("#from_buttons", RadioSet).pressed_button
                 == pilot.app.query_one("#from_buttons").children[landing]
             )
+    async with RadioSetApp().run_test() as pilot:
+        assert pilot.app.screen.focused is None
+        await pilot.press("tab")
+        assert pilot.app.screen.focused is pilot.app.screen.query_one("#from_buttons")
+        await pilot.press("tab")
+        assert pilot.app.screen.focused is pilot.app.screen.query_one("#from_strings")
+        assert pilot.app.query_one("#from_strings", RadioSet)._selected == 0
+        await pilot.press("down")
+        assert pilot.app.query_one("#from_strings", RadioSet)._selected == 1
 
 
 async def test_radioset_breakout_navigation():