This may be a silly question, but it concerns the use of the self timer on the Hasselblad 500 C/M. I've just processed a roll of film in which I had used the self timer on several frames, and the self-timed shots are all blank. Each time I slide the VXM switch to V. Also, I know the O/T lever should be on "O". Also, I probably used the pre-release each time, and I definitely had a cable release attached every time. Why are the frames blank? Is it because the cable release is attached? Your help would be greatly appreciated.