Searching in musicbrainz, after found the album and press "weiter"
On my Mac the search "loading cover", always stops with a timeout dialog.
Discogs works fine
The timeout is 60s for the request to start and 120s for the request to end. Can you recheck with v1.3.2 and see if something has changed?
Now, it work. But now the cover is found in few seconds. Log Time before the timeout before.