Checking power at the main panel with a meter may be deceptive.
Your control panel reads "No voltage indicated," but it is wired into the rv electrical system, just like the circuits that receive no power from the main panel.
I'm leaning strongly toward HarryStone's suggestion that you may have a disconnected neutral or ground at the ATS. Your meter is being grounded manually by you when you use the probes, giving the impression that everything is good. What the reading is really telling you is that the two power lines are hot, nothing more. If the neutral/ground is disconnected at the ATS, voltage will not flow to the main panel or beyond.
Again, since the problem happens with both shore power and generator, the common factor is the ATS.
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Larry, Eileen, and Finley
2004 Alpine 36FDDS
Third motor home, first Alpine, no need for another.
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