You did mention it...I tried it...no success.
EDIT:
Okay...this is me right now.
http://2.bp.blogspot.com/_zQh4wUzp4nQ/SLzXBF8_RpI/AAAAAAAAAbo/4mvq7vuy3TU/s400/Simpson.jpg
What I was doing was going into the stock gallery app and saying 'set as'...but when I went to crop the picture for the lock screen, it was sending me over to QuickPic. I hadn't noticed it was doing that...just assuming it was staying in the stock gallery for cropping.
I cleared the defaults and then tried it and when I actually selected cropping via the stock gallery it worked!
Now I feel stupid for not noticing that subtle switch.