This VCR has commercial advance. At first, it started to mismark the commercials, and mark the show instead. I turned this feature off. Everything Ok. Then, it won't rewind all the way, leaves the "first" 1/2 - 45 min. of tape not rewound. When playing back tapes made on this VCR, they will not play back properly on another VCR. The picture is either all snow, or half clear picture and half snow. Also, the sound is screwy on any other VCR when played back. Can still play (watch) any tape recored on the RCA VCR, but only on the RCA machine. Any ideas? Help would be greatly appreciated. THANK YOU!