Originally Posted by MattKing
I have found that if I intermix lens changes, dry firing, dark slide removal, rotating back removal and cocking and firing cameras and lenses, the interlocks can get out of synch.
See if you can find a lens that does work with the bodies, cock the body shutter and wind some film, cock the offending lens' shutter, mount it on the body and try it.
There may be someone I can borrow a lens off to test. I will try that and see what happens. Thanks everyone!