Just got Qarn in low level roulette and had the weirdest dungeon run I've ever had in this game.
Firstly, the first boss split into two about halfway through the fight (Obviously been taking some tips from T1!) but no one else could see it. It didn't do anything, but It kept switching my target onto it. He stayed there for a while after we actually killed the boss too.

Then at the last boss the door didn't lift for me so I couldn't walk into the boss room. I tried returning, but there was no shortcut, so I had to run all the way back. Still couldn't get in so I tried activating the side doors. It did nothing but we let the spawned adds kill me so the healer could raise me in the boss room.

This worked and I got in some hits, but during the fight I kept running into invisible walls and I couldn't target the boss or adds for most of the time, as they weren't in my line of sight apparently.

Anyone else have any experiences like this?