Unable to play game in online mode with my account #pc

Please tag your post with #pc and/or #xbox.
#pc

Are you on Steam or Microsoft Store version?
Microsoft Store

Are you using Developer Mode or made changes in it?
no

Brief description of the issue:
Starting a flight with any non third party aircraft, the loading bar stops at about 70-80%.
This does not happen when:

  • using either Aerosoft CRJ or PMDG DC-6
  • switching off online mode
  • switching to alternate account

Detail steps to reproduce the issue encountered:
Starting the game, select World Map, start flight.

Build Version # when you first started experiencing this issue:
Since SU5

Update: Switching to another account causes the game to crash upon loading a flight.