ei4ia: Thanks for your post.

Obviously something happened during the migration from 3.0.16.295 to 3.0.17.304. The migration
never gave any error messages but somthing went wrong.
Now, 4 hours later, I have done a clean install and everything looks ok again.
So far I have taken backups regularly but from now there will be a second backup with copy/paste to "paper" or perhaps I consider something else...