Can you give a link to an album that doesn’t load? If it is indeed related to specific albums maybe the current development version 1.4 of Picard is able to load them. See the downloads of daily builds on http://picard.musicbrainz.org/downloads/
Also note that the MusicBrainz servers are at the moment under heavy load, and sometimes loading albums will fail. You can usually just retry it in those cases (right click -> Refresh). See the discussions at Rate limiter has changed? and State of things, Q2 2016