My test roll with my newly acquired GA645Zi emerged as follows: Frames 1 - 8: no problems. Frames 9 - 12: light leak affecting lower edge of each frame. Frames 13 - 16: light leak affecting both lower and upper edges of each frame. My thinking was initially that this is not a problem with the camera. If it were, all frames would surely have been affected? So I concluded that the film was not wound tightly enough, hence the progressively worse light leak towards the end of the film. However, I have now noticed that the rear window showed it was set for 220 film rather than 120. I understand this setting affects the pressure plate as the film advances. Could this have been the cause of my problems?