Hello Hallvard,
In France we experienced the same issue, Mendix is investigating this, till now they gave us the advice to change your preferences from the new editor to the old editor in mendix you can do this by going to the edit pane and choose for preferences, there you can adjust it. I am not sure if this fixing your problem as well, but it seems really related.
Hope this helps!
Good luck
This is a known issue, and Mendix have a work around listed in the release notes for 10.6.2
https://docs.mendix.com/releasenotes/studio-pro/10.6/#known-issues
Create a support ticket for this with a versy simple testproject at https://support.mendix.com/hc/en-us. This should not be happening.
Regards,
Ronald
now, I am still using version 10.62 with this issue