There's a glitch with Adobe software + "Screen Effects" - have seen it mentioned somewhere, but can't remember where.
It is truly annoying - and a resinstall didn't help in my case. Even if I set a hot corner for the screen saver not to come on, if the screen dims, Photoshop crashes. InDesign, while not crashing after screen saver or screen dimming, does loose key modifiers (i.e. Shift + drag does not constrain to 45 degree angles...) after I come back.
Powerfully annoying. And none of the patches have addressed it (at least for me) thusfar.