unhandled exception

I'm getting an unhandled exception using the sample C# application and in our application.

Here are the steps:

1. Run the SyntaxEditor C# Sample Editor Application.
2. Clear out all the text by highlighting it all and pressing delete (cursor now in upper left - on line 1).
3. Between the number 1 and the cursor, just right of the yellow, left-click the mouse.
4. Status bar shows Ln 1 - Col 2 - Ch 2 - EndOfDocuementToken.
5. Start typing.

The following exception above is thrown:

Unhandled Exception: System.ArgumentException: The offset '0' added to the length '1' must be less than or equal to the count of characters in the document.
at ActiproSoftware.SyntaxEditor.Document.?(Int32 , Int32 )
at ActiproSoftware.SyntaxEditor.Document.GetSubstring(Int32 offset, Int32 length)
at ActiproSoftware.SyntaxEditor.Document.?(DocumentModificationType , Int32 , Int32 , String )
at ActiproSoftware.SyntaxEditor.Document.UndoableInsert(DocumentModificationType type, Int32 offset, Int32 length, String text)
at ActiproSoftware.SyntaxEditor.EditorView.?(DocumentModificationType , String )
at ActiproSoftware.SyntaxEditor.EditorView.?(String )
at ActiproSoftware.SyntaxEditor.EditorView.InsertText(String text)
at ActiproSoftware.SyntaxEditor.Document.?(Char )
at ActiproSoftware.SyntaxEditor.SyntaxEditor.OnKeyPress(KeyPressEventArgs e)
at System.Windows.Forms.Control.ProcessKeyEventArgs(Message& m)
at System.Windows.Forms.Control.ProcessKeyMessage(Message& m)
at System.Windows.Forms.Control.WmKeyChar(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
at System.Windows.Forms.ContainerControl.WndProc(Message& m)
at System.Windows.Forms.UserControl.WndProc(Message& m)
at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
at System.Windows.Forms.ComponentManager.System.Windows.Forms.UnsafeNativeMethods+IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
at System.Windows.Forms.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
at System.Windows.Forms.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(Form mainForm)
at TestApplication.EntryPoint.Main() in C:\Program Files\Actipro Software\SyntaxEditor\v2.0.0107\TestApplication-CSharp\EntryPoint.cs:line 20The program '[2424] TestApplication.exe' has exited with code 0 (0x0).