I'm not sure if this is a bug or if I did something wrong getting used to the new version 8. I imported info about the movie "It's Alive" and somehow the "boxset" field in just about every movie in the database was filled in with the title of that movie! I don't see a way to clean this in the field manager.
My solution: open the movie database file (*.mdb) with MS Access and delete the content of the table "boxsetlink" (but not the item "boxsetlink" itself, only the content). If Access isn't avaiable, MDB Viewer Plus 2.40 should work...
Don't forget to create a backup from the movie database file ;)