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I'm going through one of the tutorials, and am at the point where I'm trying to open a script for a hotspot.  AGS becomes non-responsive for a minute or two, and then gives back an error dialog:

Error: Non-negative number required.
Parameter name: count
Version: AGS 3.2.1.111

System.ArgumentOutOfRangeException: Non-negative number required.
Parameter name: count
   at System.Text.EncodingNLS.GetString(Byte[] bytes, Int32 index, Int32 count)
   at Scintilla.ScintillaControl.SendMessageDirect(UInt32 msg, IntPtr wParam, String& text, Int32 length)
   at Scintilla.ScintillaControl.SendMessageDirect(UInt32 msg, Int32 wParam, String& text)
   at Scintilla.ScintillaControl.GetText()
   at AGS.Editor.ScintillaWrapper.FindLineNumberForText(String text)
   at AGS.Editor.ScriptEditor.GetLineNumberForText(String text)
   at AGS.Editor.Components.BaseComponentWithScripts.ZoomToCorrectPositionInScript(ScriptEditor editor, ZoomToFileEventArgs evArgs)
   at AGS.Editor.Components.RoomsComponent.GUIController_OnZoomToFile(ZoomToFileEventArgs evArgs)
   at AGS.Editor.GUIController.ZoomToFileHandler.Invoke(ZoomToFileEventArgs evArgs)
   at AGS.Editor.GUIController.timer_Tick(Object sender, EventArgs e)
   at System.Windows.Forms.Timer.OnTick(EventArgs e)
   at System.Windows.Forms.Timer.TimerNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

I am using 64-bit Windows 7, AGS 3.2.1.  I encounter the same issue when opening scripts in any other context.  Has anyone encountered this before?