When in windowed mode, the game is unable to refresh after locking the computer [windows key] + L. After returning from the lock the windowed area for the game is black. I minimize and restore and it is still black. The only solution is to kill the game and restart.
Hmmm. This is annoying but not a complete surprise, as this can cause havoc with directx if not handled correctly. Looks like I need to investigate. Sorry for the hassle, I will add it to my list.