i found this on google....

http://www.adobe.com/cfusion/knowled....cfm?id=316693

i think maybe because of all that cropping you tried to do on that big ass image you were having problems with before, you might have filled up the task recorder(i made that word up). the thing that remembers everything youve done on photoshop so that you can undo it later if you want.

try to save the file as a different name, and retry.