Screen going black during game

I don't know if this has been reported yet but sometimes while I'm playing the entire screen goes black. Everything still works and I can reveal the board by picking up a piece and "painting" away the black to reveal the board. It just sucks when it happens, especially when I'm low on time.

I use:
Chrome/11.0.696.50
Windows Vista Business w/ Service Pack 2
1366x768 resolution

QuickTime Plug-in 7.6.9

Java Deployment Toolkit 6.0.240.7
Java Platform SE 6 U24

Flash 10.2.154.27