Well before the patch the quest to clear a path to the altar was bugged and you couldn't get past the 1st stage (which is now fixed it seems). Now there is a NEW even more absurd bug. If you are in a group and you proceed to the final boss, there is a type of "gate" made out of branches to the entrance of the final room. However, ANYBODY who has completed the quest PRIOR does not get access to the last room, and is blocked from going into it. Thankfully we had a healer that could heal from behind this invisible "wall", but if our main tank would of not been able to get through....we would of never been able to complete it. I am beyond frustrated with these patches. For everything Zenimax fixes, they break 3 more.