Is it normal for the Pro to shoot only 14 pix per roll? Most 645s shoot 15 or 16.
About the 14 frames, check the pin goes from the back of the camera to the film back, if you look at the camera it will be at right top 1/4 next to the shutter. The little metal cup around it was loose on mine and it did way wackier stuff that that. Try 10 with very uneven spacing between the photos. Yeah make sure that cup is screwed in tight and the pin move smoothly. Hope that helps.
Sigh, Only if i have 200 bucks I'd buy that Prism in a heartbeat. haha.