Heads up for my fellow Photoshop users, my copy did auto update today and suddenly would not let me save jpegs, png, or targas. Had to roll back to a previous version. 
It kept trying to say my files were too big to save as those formats when I know very well they were fine sighs
Eek
I found that happened to me and it ended up being temp files/disk space issues
hugs my Cd Rom of Photoshop CS5
uses a hand crank to start it