Well, I just took my RB67 ProS on its first outing and developed the film. Unfortunately, there appears to be a problem with the back. I shot three rolls and each seems to have a problem with the starting point of the roll. On one of them, the first image is kind of close to the beginning of the film, but usable. Another roll has the first shot overlapping the tape at the bigging just a little. The other roll has only eight images with the first one half off the front end of the roll and a very large amount of blank film at the end.
The only idea I have is to replace or fix the back. Does anyone else have an idea of something I could check or something that I might be missing that would cause this problem? I read the manual that Mamiya has on their site and think I loaded it correctly, but I am not entirely sure that I didn't miss something important. I do know that I wound the film to the start arrow for each roll.