|Project:||The Open Toolkit library|
I have only tested this on Windows 7 64 bit.
The issue can be reproduced using a GameWindow, and in the constructor, attaching to the KeyDown event. In the handler, check if the KeyboardKeyEventArgs.Key == Key.Enter. Also check whether Alt is pressed. To check the alt key, do this:
this.Keyboard[Key.AltLeft] || this.Keyboard[Key.AltRight]
If both conditions are met (alt + enter), change the fullscreen state or something obvious.
This works, but the alt key has to be released and depressed for this boolean expression to equal true again.