I am having problems with system lock-ups. When I place the curser on a pull-down box, the box will open then fade away into a ghost-like image, and the system locks up completely. It happens once or twice a day. And I've been in the middle of placing orders on TradeStation twice when it happened. I'm running Windows XP, P4, two monitors (one flat, one CRT). Has anyone else run into this problem?