Waiting seems to work but it varies how long it takes. I tested it again earlier and after like 1 hour it was still frozen. Now when i tested it just about 10 minutes ago again it just took like 10 minutes. It looks like it works for me now I will keep experimenting around and see if it really works now.
Thank you very much
Edit: After the first Ground Combat Mission I keep getting "Empty" Crash sites
(No Aliens --> Insta-win screen) Don't know if this is related in any way , so I'll look if this already exists or I'll open a new Thread.