I cannot load any different airport and plane - always the same airport and same aircraft - non ascii windows 10 account name

Your suggestion solved this problem for me. And of course. Why have we not thought about it something before. It’s actually a children’s lesson for any programmer. But who would have thought that it was the alphabet problem that in 2021 caused problems in a microsoft program?
Incidentally, it also solved another problem for me:

Now it all works again. And my machine has become noticeably faster in performing the various processes.
Thank you very much. In my case, it was the use of “æ” that gave the problem.