Trados 2021: error message: Ein Teil des Pfades "C:\Users\snowb\AppData\Local\Temp\SDLTempFileRegen\sdlxliff_11a14b0a-0cdc-43c1-b8bd-2d6b085463a3.tmp" konnte nicht gefunden werden

Hi everybody, I am getting this message out of the blue and cannot save my file. I checked the thread, but cannot even find the "SDLTempFileRegen". It started after updating to the most recent version. Any problems there?

I tried the existing solutions, but nothing works. I can only delete the project, create it anew, but after a while the problem suddenly reappears. 

Can anyone help?

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