<p>I bought an F4 on Ebay and it seems to be in good shape, or at least it hasn't been obviously mistreated. I've run into a problem, though, and hoped some of you might be able to make some suggestions, since I've never used an F4 before and it's a pretty complex machine.<br> When I load film, close the door, and press the shutter release, it advances to the first frame, as it should. Push the button again, though, and the film advances several frames and then the red alert LED comes on. Reload and the same thing happens. This has happened with both bulk-loaded and regular film, so it's not a problem with individual rolls or types of rolls.<br> Can anyone think of something I might be missing here?<br> Thanks!</p>