Random OTA recordings are blank, while NO sat recordings are blank. AM21 setup worked flawlessly with HR22 for 5 months. Trickplay on OTA recordings is also a tad buggy, with audio dropouts and xtra jumps forward or backward. None of which I see on Sat recordings.
I am having exactly the same issue with two HR24's. An OTA recording immediately jumps to the keep or delete screen. No issues with an HR20 with built in OTA tunere or with my HR22/Am21 STB's. Fortunately I am able to record from the satellite feeds and only use the OTA in "Rain Fade" situations.