If you  have the same problem like me that you startup Teams on a Monday morning and nothing is showing up correctly / displaying weird things:

and also the standard error-handling – restarting teams, restarting computer is not working… and you don’t have time for further investigation because the daily scrum is around the corner – a fast fix – hit right mouse click at teams -> settings :

and switch to Teams Dark design:

and you can make your meetings… of course it’s a workaround and we have to investigate what is happening here…