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Error when trying to set termbases (SDL Trados Studio 2019 SR2)

Hello,

Termbases seem not to be working in my SDL Trados Studio. I recently purchased SDL Trados Studio 2019 SR2 and also downloaded the matching version of SDL Multiterm 2019 CU3 Desktop.

When I click on the icon for 'Termbase settings of the project' in the box at the top right corner (Editor view), there is this error message: Collection was modified; enumeration operation may not execute.

Also, when I go to 'Project settings" and under 'All language combinations' I click on Termbases, there is this other error message: Failed to create setting page.

What should I do? Compatibility of SDL Trados and Multiterm versions should be fine, I think. I've read in another similar thread here something about deleting a folder in AppData > Roaming > SDL, but of course I don't want to touch anything without being sure. What may be the issue?

Thanks a million!