Same issue here! Ever since I updated both Trados and Multiterm, it seems like they're not connected anymore. Trados can't attach TB's while I can only open them in Multiterm.

Diane Epassa 

Did you update MultiTerm as well?

Your message looks different... where are your termbases?  Are they on OneDrive?

Yes I updated Multiterm as well, I even reinstalled it twice but still nothing. My termbases are in the folders not on OneDrive. But i use parallel Desktop for Windows on Mac

When i try to upload the termbases manually this is what I get

Diane Epassa 

The only thing I can suggest, as I don't know MAC at all, is that you make sure your Termbases are really accessible on a Windows drive.  We have had several cases in the community in the last couple of weeks with users who eventually realised the mistake was on their end.

What's the path to the termbases and do they open in MultiTerm if you double click on them?

Diane Epassa 

The only thing I can suggest, as I don't know MAC at all, is that you make sure your Termbases are really accessible on a Windows drive.  We have had several cases in the community in the last couple of weeks with users who eventually realised the mistake was on their end.

What's the path to the termbases and do they open in MultiTerm if you double click on them?

Yes they open only in Multiterm

Diane Epassa 

Does this help?

 RE: Terminology database file not found after update 

But don't use OneDrive!