Problems with Trados Studio 2017 - Icons are greyed out, error message when starting "Datei konnte nicht gefunden werden"

 After installing SR1 for Studio 2017 I encountered a lot of problems. The most irritating one is the error message "Datei konnte nicht gefunden werden" after a short work break of a few minutes. I don't know which file Studio relates to. Also a large number of buttons are greyed out like "Export zweisprachige Überprüfung" in the "Überplrüfung" menu or the arrow icons for navigating to the next segment up or down. When I use a filter in the "Überprüfung" menu, I cannot reset the filter after editing the relevant segments. I have to exit Studio and restart it to see all segments (instead of just the filtered ones).

Unfortunately I don't have the previous Studio 2017 installer and cannot revert to that.

Any idea?

Thank you.

Dorita

See screenshots