Error at startup

[Kaboom]

Received the following error during startup. It was working just fine earlier in the day. A reboot cures the problem. Error message appended below.

See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
Error in the application.
-2146232832 (Unknown)
at Microsoft.DirectX.Direct3D.Device.get_De viceCaps()
at WorldWindow.WorldWindow.OnDeviceReset(Ob ject sender, EventArgs e)
at System.EventHandler.Invoke(Object sender, EventArgs e)
at Microsoft.DirectX.Direct3D.Device.raise_ DeviceReset(Object i1, EventArgs i2)
at Microsoft.DirectX.Direct3D.Device.Reset( PresentParameters[] presentationParameters)
at Microsoft.DirectX.Direct3D.Device.OnPare ntResized(Object sender, EventArgs e)
at System.Windows.Forms.Control.OnResize(Ev entArgs e)
at System.Windows.Forms.Control.OnSizeChang ed(EventArgs e)
at System.Windows.Forms.Control.UpdateBound s(Int32 x, Int32 y, Int32 width, Int32 height, Int32 clientWidth, Int32 clientHeight)
at System.Windows.Forms.Control.UpdateBound s()
at System.Windows.Forms.Control.WmWindowPos Changed(Message& m)
at System.Windows.Forms.Control.WndProc(Mes sage& m)
at System.Windows.Forms.ControlNativeWindow .OnMessage(Message& m)
at System.Windows.Forms.ControlNativeWindow .WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callba ck(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


************** Loaded Assemblies **************
mscorlib
Assembly Version: 1.0.5000.0
Win32 Version: 1.1.4322.2032
CodeBase: file:///c:/windows/microsoft.net/framework/v1.1.4322/mscorlib.dll
----------------------------------------
WorldWind
Assembly Version: 1.2.1720.24886
Win32 Version: 1.2.1720.24886
CodeBase: file:///C:/Program%20Files/NASA/World%20Wind%20v1.2/WorldWind.exe
----------------------------------------
System.Windows.Forms
Assembly Version: 1.0.5000.0
Win32 Version: 1.1.4322.2032
CodeBase: file:///c:/windows/assembly/gac/system.windows.forms/1.0.5000.0__b77a5c561934e089/system.windows.forms.dll
----------------------------------------
System
Assembly Version: 1.0.5000.0
Win32 Version: 1.1.4322.2032
CodeBase: file:///c:/windows/assembly/gac/system/1.0.5000.0__b77a5c561934e089/system.dll
----------------------------------------
System.Drawing
Assembly Version: 1.0.5000.0
Win32 Version: 1.1.4322.2032
CodeBase: file:///c:/windows/assembly/gac/system.drawing/1.0.5000.0__b03f5f7f11d50a3a/system.drawing.dll
----------------------------------------
WorldLayers
Assembly Version: 1.0.1720.24886
Win32 Version: 1.0.1720.24886
CodeBase: file:///C:/Program%20Files/NASA/World%20Wind%20v1.2/WorldLayers.DLL
----------------------------------------
Altova.XML
Assembly Version: 1.0.1720.24885
Win32 Version: 1.0.1720.24885
CodeBase: file:///C:/Program%20Files/NASA/World%20Wind%20v1.2/Altova.XML.DLL
----------------------------------------
System.Xml
Assembly Version: 1.0.5000.0
Win32 Version: 1.1.4322.2032
CodeBase: file:///c:/windows/assembly/gac/system.xml/1.0.5000.0__b77a5c561934e089/system.xml.dll
----------------------------------------
Altova
Assembly Version: 1.0.1720.24885
Win32 Version: 1.0.1720.24885
CodeBase: file:///C:/Program%20Files/NASA/World%20Wind%20v1.2/Altova.DLL
----------------------------------------
Microsoft.DirectX
Assembly Version: 1.0.1901.0
Win32 Version: 5.3.0000001.1126 built by: DIRECTX
CodeBase: file:///c:/windows/assembly/gac/microsoft.directx/1.0.1901.0__31bf3856ad364e35/microsoft.directx.dll
----------------------------------------
WorldWindow
Assembly Version: 1.2.1720.11954
Win32 Version: 1.2.1720.11954
CodeBase: file:///C:/Program%20Files/NASA/World%20Wind%20v1.2/WorldWindow.DLL
----------------------------------------
Microsoft.DirectX.Direct3DX
Assembly Version: 1.0.1901.0
Win32 Version: 5.3.0000001.1126 built by: DIRECTX
CodeBase: file:///c:/windows/assembly/gac/microsoft.directx.direct3dx/1.0.1901.0__31bf3856ad364e35/microsoft.directx.direct3dx.dll
----------------------------------------
Microsoft.DirectX.Direct3D
Assembly Version: 1.0.1901.0
Win32 Version: 5.3.0000001.1126 built by: DIRECTX
CodeBase: file:///c:/windows/assembly/gac/microsoft.directx.direct3d/1.0.1901.0__31bf3856ad364e35/microsoft.directx.direct3d.dll
----------------------------------------

************** JIT Debugging **************
To enable just in time (JIT) debugging, the config file for this
application or machine (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.

For example:

<configuration>
<system.windows.forms jitDebugging="true" />
</configuration>

When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the machine
rather than being handled by this dialog.