Update - first feedback from support @AerosoftDev:
"Hello,
Thanks for contacting us.
Unfortunately, this issue is due to a problem with an earlier version of the sim/sdk, and the developers of these sceneries are aware of the issue and have been working on patches. Most of these should have an update out to resolve this soon! In the meantime, if you have Navigraph installed as your main sims database, it should bypass the problem."
I asked if they can be any more precise about “soon” - lets see what we’ll get. But as far as I see this seems to be the solution - patiently waiting for patches… 