Just adding this there to bump up the thread. I've noticed several bugs in the dungeon as well.

Several times in the run, killing a monster will result in the display of the message "An opening has formed in the sticky web!" (This, by killing monsters, not webs.)

More rarely, but nonetheless discomforting, if a play is too far behind when a Sticky Web is destroyed, when they'll walk up to it the Web will still be there, non-targetable, non-destroyable, and will be blocking the player's passage. After having this happening to me and others about 3 times, we found out this can be fixed by logging out and back in, but I still think it'd be best to address the issue so that it doesn't occur anymore.

This leads me to think, maybe the coffers dropping no Etheral Armor is also a bug? Could have SE seriously messed up that much with a dungeon? I may post this up in the Bugs Report too.