While running some of the examples, pressing the F2 key switches to fullscreen properly. But sometimes the computer hangs halfway when switching back to windowed mode. By "halfway", I mean that I see a black rectangle on the top left and rest of the screen is grey. There's no way to stop the application with escape key or windows task manager. BTW, this is on Windows 2000 and compiled with SharpDevelop. If anyone has come across this and resolved it please let me know. Thanks.