Preview shows files as locked while they are not locked.

Hello, it's really starting to annoy me that I can't seem to edit any pictures with Preview anymore since I upgraded to Lion. Every time I try to save an image after resizing or whatever, it says the file is locked. If I check the info of the file the "locked" checkmark is unchecked. And I have all the permissions to the file. Tried everything, switched the "lock after 2 weeks" thing of in Time Machine (even though tha would probably not help: images I took today are still "locked" in Preview), tried copying them and then saving them, and tried to lock them and then unlock them, but I can't seem to edit and save them. Driving me nuts as the only way to save them now is under a different name and I don't want that. Any ideas?

Mike