My screen blinks if I hold down the left mouse button for more than a second or two and I see my ProTools screen underneath. It's not serious...no crash or anything, just a nuisance. Is there an engine setting I need to adjust? Everything else works perfectly with the new update and I'm having a great time learning the program. Has any body else gotten the screen blink? I'm using ProTools 7.4 on a quad core xp 32 system with 4g of ram. Thanks.