Cover Art Archive is currently down.
When trying to load a release in Picard that has some CAA scans, it will hang there for several minutes:
[loading album information]
Looking at the console logs, you should see (I replaced MBID by xxx):
E: 19:34:01,985 webservice._handle_reply:535: Network request error for https://archive.org/download/mbid-xxx/index.json -> Error transferring https://archive.org/download/mbid-xxx/index.json - server replied: Service Temporarily Unavailable (QT code 403, HTTP code 503)
E: 19:34:34,004 webservice._handle_reply:535: Network request error for https://archive.org/download/mbid-xxx/index.json -> Error transferring https://archive.org/download/mbid-xxx/index.json - server replied: Service Temporarily Unavailable (QT code 403, HTTP code 503)
E: 19:35:11,602 webservice._handle_reply:535: Network request error for https://archive.org/download/mbid-xxx/index.json -> Error transferring https://archive.org/download/mbid-xxx/index.json - server replied: Service Temporarily Unavailable (QT code 403, HTTP code 503)
Then last error and the release finishes loading:
E: 19:36:42,247 ui/item.error_append:108: <Album xxx ''>: CAA JSON error: Error transferring https://archive.org/download/mbid-xxx/index.json - server replied: Service Temporarily Unavailable