I did most of the group dungeons, but, after the patch that changed the icons for the dungeons (it was the dyes patch, or the one before that) the icons of every Group Dungeon I had completed turned black, as if I hadn't completed it. The achievements and the quests pertaining to those dungeons are still completed, and even if I run a dungeon again the icon wont turn white. I also noticed a little mess up with the lorebooks (Wayrest sewers lorebook got swapped with arx corinium lorebook, so that I had arx corinium completed, but I hadn't its lorebook, while I had the wayrest lorebook without ever setting foot there), but I managed to fix that... I know it's a minor bug, but it's annoying.