On manual query / discogs I don't have the preview of the cover, does the same thing happen to you too? I updated the version of CATraxx_internet.dll but also with the previous one it was like that. When updating the dll I got the error "DeleteFile failed". I renamed the dll I had installed and the next update attempt went OK. I wanted to know if this has happened to you too.
My trick (renaming the dll) was to fix the "DeleteFile failed" error. For the cover I would say it was in the previous version of the dll and also in the latter it remained. I have verified that in addition to the preview of the cover these are not uploaded to the DB when importing the data from Discogs.