I also have a StealthCam and I haven't had that problem. In almost al my pics there are deer. Sometimes it's a but or the head of one, and not the whole deer, but it's never blank. I doubt that the feeder going off is setting off your camera. Something is probably flying through the lazer or walking through it before the camera has time to go off.

And unless you have a roll of film that is 100 exposure, there's not that many pics on your camera. Perhaps it's the number of pics to take in a few minutes? Or the minute delay between pics? Sounds like your settings are messed up to me. At the most, my camera will say 27 because I put 27 exposure film in it. I also have it set for one pic every 4 minutes. Check your settings. If all is good, you might return the camera and try again with another one. I hear alot that with SC you either get a good one or a lemon.