Originally posted by Bob 256 the pressure plate may be losing it tension and be unable to press the film flat against the film rails. In that case, it would be an issue.
I agree, the whole point of the pressure plate is to keep the film smashed flat against the rails, since the 67 isn't an auto advance camera you can set the pressure plate as firmly as you want to (within reason). Some films like T-MAX have thicker film bases than more common filmstocks and because of this, some people like to tweak the pressure plate a bit to make it easier on the crank mechanism to advance the film this could have been the case with your camera.