Got a problem with my new XE-1. Film advance lever works, charges the shutter and the shutter fires (in manual anyway - have an issue with the meter but that's for another day). But the film counter doesn't advance and the film spool doesn't move either. Weirdly, when I got the camera, the counter was at 36. It reset to "S" when I opened the camera back. The back couldn't be opened as the rewind knob was off. I removed the bottom cover, sprung the latch to open the back and reattached the knob. Before I did that, however, I used the multiple exposure switch just to see if it was working (it seemed to work fine and returned to it's start position by itself). So - any advice as to what might be wrong? It's as if the multiple exposure mechanism is somehow still engaged within the camera (though, as I say, the switch on the top plate is in its start position and returns there when I select it and wind on).