Hi!
After I experimented with Text Mesh Pro, I can’t load any scenes anymore. What I did, is to mark multiple text objects to changed the color and this Mac mouse working circle appeared and never disappeared. So I had to restart Unity. All my scenes can’t be loaded. Unity just stop working.
At least I had a backup 3 days older than this broken project, so I started the backup, copied the scenes from the broken project to the backup project. And also copied some graphics, models etc. I imported after this backup, so it works again. 
What should I do if I didn’t have any backups? Maybe I could delete Text Mesh Pro Asset and reinstall it.
Hey Rabagast,
If you run in to this problem again, you can always try deleting your Library\metaData folder inside your project and letting unity recompile your project.
If it was a case of bad data, it should correct itself.
If it is more than that, you may need to dig in to the editor log and see which files it is choking on.
The editor log can be found here:
C:\Users(UserName)\AppData\Local\Unity\Editor
It will contain some information as to what the issue actually was if you run in to it again.
Thanks for all the replies. But thanks to my backup, I fixed it. I just used the backup and copied the scenes from the broken project. So I didn’t lose any changes I did, since the last backup.