I'm currently entering all the records of a Box Set including 87 records. I've entered up to 57 records until today. The search for the release group shows only number 3 to 55. If I search for the releases I also don't see all of them.
If I do a direct data base search I get each of the records. The same aplies for the records stored in my collection. Therefore I know the records are in the DB they just don't get displayed.

The release group has the name: "Ludwig van Beethoven Complete Works (87 CD Box Set am@do classics)"
Example: http://musicbrainz.org/edit/14980633; http://musicbrainz.org/edit/14980554