Well when playing as a Tank I've noticed that the icons next to the monsters showing the aggro status (Red Square / Orange & Yellow Triangle / Green Circle) seem to be displaying incorrectly of late. Many times I've been trying to get the aggro on a mob with a Triangle symbol and a quick glance at the actual aggro bar on the player icons (the white bar) shows as me being the top target.
This isn't a show stopper but it's becoming an annoyance when I'm spamming AOE aggro generators without the need to. Even if I select that target in particular it will remain as a Triangle even though I'm at full aggro.