Well, I just returned in disgust after a 3 hour long photo shoot. After three hours of hiking through forest, swapping lenses, kneeling and stretching to get my camera in all sorts of positions, and even getting my jacket completely muddy for one shot (I was kneeling on it and the ground was really wet) - my camera kept on shooting after the 36 exposure limit! Puzzled, I carefully pried off the back, to discover that the film hadn't advanced past the first exposure!!! Somehow, I made a small mistake when I inserted the film, and thus it slipped off of the little winding peg. This basically means that for three hours I was carefully metering my light, changing aperture and shutter speeds, swapping lenses, for NOTHING. Gah.