I think the problem has been fixed, at least for now. I redefined my default aircraft/flight using the F-35 and the problem went away. It is very strange, but a number of simmers I've talked to have found using the F-35, instead of the F-22 or other default aircraft, as the default (first loaded) aircraft/flight in P3Dv4.4 has fixed some very odd problems. If usually is sufficient to just load the F-35 in the spinning preview window before switching to the desired aircraft. If that fails, loading the F-35 onto a runway and then switching aircraft may work.
Many thanks again for your continued support that went well 'above and beyond'!
workaround loading the simulator with the default F-35
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