OK, here is what is happening. Restarted receiver and re-ran antenna set up. The channel comes in fine with a strong signal. While watching the channel I set up a Manual Record and it did record. So, I set it up to manually record each weekday at the same time beginning this morning. And just like it did last week, the Manual Recording did not work, the channel is now black, and on the History is says that the Recording was cancelled. In order to get the channel to appear again, I have to restart the receiver.
Probably time to call DirecTV, although those first-line CSR's may not be at all familiar with OTA recordings, let alone manual recordings.