1) Pets constantly get stuck behind boss fight walls and companions from shrines will not follow to the next zone (including map dungeons and boss fight walls).

2) Clicking on a doorway while 'Rolling' or casting will sometimes cause your character model to disappear and become unable to do anything including Teleport home.

3) I've often come into map dungeons with tags affixed 'Kill target monster' and 'kill enoungh monsters' and often times not enough monsters spawn or the 'Boss' monster is no where to be found on the map.