I was watching the NASA channel (which, BTW NASA has provided free in HD for years, but Dish doesn't - only SD), and I wanted to record it. So I rewound to the beginning and hit record. It said it was recording it, but it never did. I tried several times. Each time it claimed it was recording, but didn't.
No. Other channels have refused to record. PBS (My channel 9 [Dish not OTA] KQED - San Francisco) failed. It only seems to be an issue when watching live and rewinding and attempting to record from where I first started watching.