A bunch of us were working on nightstone, and AOEs and monster abilities were off for everybody. I must've died 8-9 times to AOEs that weren't even on the ground. Here's a screenshot of one carrion swarm that never even got near me, yet killed me (and many others, repeatedly)
There was also this gray host that was snapped to the hill and kept rubberbanding/resetting when we'd pull him into the middle of the storm.
Pings were fine, my abilities were triggering fine, it was the enemy stuff that was off for everybody (surveyed those present when it was finally over).