I've done more testing and it seems that there are certain games that will cause LB not to import anything but the problem games. If I deselect the problem games and only import the missing games, they import fine. So as long as I don't try to import Ikaruga, Radirgy, Slashoutr, Spawn, or Trizeal, everything else imports fine. I can then import those problem games separately without issue. It's the strangest thing.