I was in the local shop yesterday and took a shot on a $20 FG with a motor. When I first picked it up and hit the shutter button, the mirror when up but nothing else happened. This is consistent with what I've seen on FEs with dead batteries, and as on an FE setting the shutter speed to the one manual speed(M90 on the FG) caused it to fire the shutter and return the mirror. We dropped new batteries in it and did a general pencil eraser clean-up of the contacts. The shop buys bulk no-name LR44s from China, so I don't know how good their quality is, but in any case once those were in it seemed to be fine. The meter was accurate enough on an in-shop test(one advantage of knowing a camera shop well is that you can check meters just by pointing the camera with a lens mounting at the right place) and the slow speeds sounded close enough by ear. I played with it a bit last night to finish up the roll of film that came in it. As per the manual, if the finder LEDs light the batteries are good. I went to take an exposure at 1/60, and the same behavior as earlier repeated-specifically the mirror stayed up and didn't come down until I went to M90. After that exposure, the LEDs no longer lit. I'd be inclined to blame the batteries, but I've bought plenty of F2s with these same batteries. Furthermore, the shop sells a LOT of student cameras(enough that I've bailed them out before by coughing up AE-1s and the like in August and January) and for students will replace the batteries if they die in the course of the semester/year. I know we've had some recent discussion about the little two-cell battery holders shorting, but the symptom of that would be the camera IMMEDIATELY not working-not working for ~6 hours. Any ideas? I'm out of town and have a big stash of SR76s at home, so won't change batteries until I get back on Monday, but I'd like to not keep throwing good batteries at it if there's some other problem. Also, does this camera have an off switch? I didn't find any reference in the manual. Even though the advance lever "snaps" out, the shutter will fire with it in either position.