i've been fooling around with settings a bit, i've set the graphics card to a full horizontal desktop (it treats the two screens as one wide screen, basically) instead of an extension. The task bar is now across two screens (and my browser window covers two screens as well, which is a bit much
... i haven't had any crashes anymore.
Yesterday i had a whole bunch of crashes when i tried to play videos (before i changed the graphics card settings), so i think the problem is more in the graphics card department than having to do with photoshop. I'm going to try to reproduce the crashes in photoshop, but maybe this problem is fixed.
That being said, i liked the single screen desktop + extension better than the double screen horizontal desktop, i think, but if this new setting stops the crashing, that is fine by me for the moment.
(Any better suggestions are welcome though.)