Today's patch was awesome and thanks to the devs and everyone for getting it out so quickly, however, there is still a rather large and game breaking bug plaguing both AA and HRC.
AA will, most likely - though not always, hard crash anywhere from 3 to 10 party members on the second phase or second rotation (whatever you want to call it) of abilities of the foundation atronoch. This hard crash is immediate and without warning. Lag isn't part of a "tell" that it will happen. ESO will just crash to the famous "Tell us what happened so we can fix this" page while the encounter continues for those that were randomly chosen to keep fighting.
HRC upon completion of killing the warrior, will continue to keep the counter rolling. This is most likely due to the new ruleset for getting onto the leaderboards. That's fine, except that whatever mob you may need to kill to get the full clear has probably embedded itself in a wall or off the map, but is still being tracked by the encounter. So any of your poor buddies that died during the warrior encounter can't rez if you're out of souls because the timer is still running. They miss out on the loot and have to drop group and run back in to turn in the quest. Warrior is dead and the timer is still going.
So, sorry about the wall of text, but these are both new and serious bugs in the trials right now. If I had to categorize them, AA would be game breaking and HRC would be a serious bug.