I ran into a problem the other day with our 6412. There were two shows scheduled to be recording at the same time. I was watching one of them, then hit "swap" to switch to the other one, and the screen was just black. I left it alone and swapped back because I didn't want to mess up the recording. When the recording was finished, I went to watch the show, and it said it was 60 minutes, but when I try and view it, I just get a black screen and then the option to delete or save it.
After that, I went and did a "swap" again to the other tuner, and the screen was still black. If I changed the channel, the picture would come back, but if I swapped back and forth, it would just be a black screen.
I ended up unplugging the power from the box and plugging it back in, and that seemed to clear it up for now - except for the part about the angry wife and her program that did not record.
Has anyone else experienced this problem?