UI doesn't show, starting Window is permanent, GPS doesn't work and "Ready to fly" Buttom dissappeared

TL;DR: PC, Win-10, never an Issue.
-Tried SU_9 Beta
-Reverted Back from Beta to now SU_8 again

Issues:
-POI only shows with Vanilla Planes, only shows 5 Options though, no VFR Map and some others are missing.
-The little Window on the lower Left doesn’t disappear ever
-The “Ready to Fly” Button to Skip Intro doesn’t appear
-The PM50 GTN750 doesn’t work and some other Avionics as well, their Screens remain black.
-Cannot Open “Fuel&Payload” or “ATC” Windows, even with direct Button Commands.

This is with Automatic Engine Start after 5 Mins.

And then sometimes it does this, with many missing UI pieces and they don’t work.

Did you follow the directions in the “Read First”

https://forums.flightsimulator.com/t/read-first-welcome-to-sim-update-9-beta/507612

In this it also states “There is always a risk that you may have to re-install the sim when joining/leaving a flight, so please keep this in mind before participating”
You nay need to do that.