The first thing I tried was JSheridan's suggestion. PTAT was recording, so I turned PTAT off and then reset my HWS so that nothing would be recording. Then I shut off the receiver (standby) and used my Fire Stick to watch Netflix for the next hour. When I turned my HWS back on, there was still no program guide.
The next thing I tried was to go into the Diagnostics menu and selected: Status, Check Status. Everything checked out OK except that the box marked 'A' (System Status) had an error. The error was: 'port 1, no signal'. I assumed that that meant I was not getting a signal from one of the satellites (I am on Eastern Arc - 2 satellites) and that would explain no program guide.
Then, still in the Diagnostics menu, I selected: Dish, Test Installation. When the test completed, it stated that it found 'less satellites than I had previously', and prompted me to either select Save, or Cancel. At the same time that this message was being displayed, the screen showed that both the satellites (61.5 and 72.7) were both receiving signals and the boxes that indicated the signal was OK were both checked. I selected 'Cancel' and did not save the results of the switch test.
Believe it or not, when I exited out of Diagnostics, when I was back watching TV, a pop-up showed up on screen that said the receiver was downloading the program guide and warned me not to try recording or setting any timers until it was finished. A couple of minutes later, the download finished and my program guide went out to 8 or 9 days like it should.
I am confused about what happened. It looked like me performing the Test Switch was what finally provoked the program guide to download. The other weird thing is that no channels were missing when the guide refused to download. I do not understand why I saw the 'port 1, no signal' error when no channels were missing. Maybe doing the switch test made the receiver come back to life?
Anyone have any thoughts about what might have happened?