I am playing on multiplayer and doing monoliths taking several times to work, for example the second quest in monolith no quest indicator or text is appearing, and even if i kill the cultist (black sun) quest does not end, then for final quest in black sun it took me entering and leaving 4 times for the boss to appear.
side note:
I ran into another bug a while back but it only appeared on one character also in multiplayer but when I imported an loot filter, all my items disappeared and my character model had no items on him anymore, when I teleported back to town my items were all dropped on the ground thankfully (This happen in .90 but had a couple patches since, only appeared once.
Love the game so glad to report the bugs.