First, never let anyone borrow your equipment.... Second and more importantly, if you do, make sure you have time to test it when you get it back...... Ugh!!!!!! The little lock knob is clearly pushed forward, yet, it still will not move... When I lock it, it restricts the movement a little more than unlocked, but either way, it will not trip... I can release the shutter with the tab, on the lens itself but not from the body.... Anyone? The lens change knob is set on lock... Its on single exposure... I can remove the lens or replace and it still won't budge.. I have also tried it with film loaded.... Please help, I have a wedding to shoot tomorrow. Its not my primary camera but I really enjoy using it for key shots.