As you might know, we recently released Picard 2.0 stable. One of the major problems with the macOS version of the same is that is very unreliable. It works perfectly on some systems and doesn’t on others with the same macOS version. See PICARD-1212 for example.
Another major problem we are facing is code-signing Picard 2.0. In order to ensure that our macOS users have a seamless experience, we paid for an Apple dev account, but we are unable to code-sign Picard. See PICARD-1296
If you have experience with either and are willing to help, please email us at – email@example.com or join us on irc at #metabrainz (freenode).