So, I've had my camera now for about two weeks. Everything thing seems to be working well, BUT I'm having an annoying issue with the film back. When I put in the slide to remove the back, or to keep it blocked so I don't accidentally expose film (though mostly, I just slide in the slide so I can take off the film back for fun since it's a new exciting toy!) It seems to have trouble locking back on the body. The little black release button for the film back snaps out, but with the slide removed and placed back in it's holder the shutter isn't always ready to shoot. I don't know why this is. I've also had trouble getting the slide back in to the film plane to remove the back. It won't go all the way in. Yes, the shutter is always cocked when I have tried this. There is a part of the mechanism that seems to stay locked even though I've tensioned the shutter. After a blank exposure (not a lost frame, I rewind with the multiple exposure button pushed so it just re-tensions the shutter)it seems to come around, or if after locking on the back, I push the release button again and re-latch it then it seems ready to shoot. It's not major, since the camera is still working, but obviously something is wrong. Now, one thing I know is that my magazine is not matched to it's insert. Not sure how it got switched. My seller says it's the only magazine he's ever owned and he is the original owner, and maybe it's been switched by accident during a repair. Could the unmatched magazine (which has no winding issues or frame spacing issues, I tested it already) be causing body engagement issues? Sorry, that's a mouthful.