I haven't had this problem, being an old pro with a variety of film cameras and understanding how to make sure that the film is actually engaged with the take-up spool . But the consistent problem I do have with the Bessa R is this:
Let's say I load a roll of 24 exposure film. Making sure of the above problem might cost me a frame and it's easy to forget this. So there I am, shooting away, looking at the frame counter and it says 23. I try to advance to 24 and Ooops! Can't fully advance the lever. Then the camera jams. I push in the rewind pin. Waste of time. At this point you either need a change bag or a darkroom nearby so you can open the camera.
No other camera I've ever had did this. Aside from this, it's a wonderful camera. What I do now is quit at frame 21. Then it rewinds just fine.
Don't try to push it.
Has anyone else had this problem? Or is it just my camera?
Ted