Ever since the most recent patch, I'm having trouble open Uberchests. For example even though my character is now up to level 15 and I'm playing on level 6, I still can't open the Uberchests on levels 2-3.
I've had the same problem. I haven't opened any on my character (Level 7, wooo hoo). Although I don't really know how they are supposed to be opened anyways.
Uberchests are tied to levers somewhere on the floor. Flick all the levers you find and eventually all the uberchests on the floor will be unlocked.
I ran thru the level I had just finished making sure I had clicked on all levers I could see. There was one that said it couldn't be moved and the chest still would not open. (Seem to recall that happening on other levels where it opened up one of those hidden loot areas.) Did all the quests on the level, so I'm not sure what I missed if anything. Looking around more carefully on the level I'm working on now so I can try to work this out. Don't get me wrong, I *love* the game as it has solitaire beat hands down while I'm working for a programming change I'm working on to finish!
I think levers that are stuck in place are the ones that reveal hidden passages and trigger traps... I think the ones that can move back and forth are the uberchest ones.
There was an issue at some point where save/load (and possibly dungeon level changing) would mess up levers. We'll have to have another look at it. Heck, there's even some custom art exclusively for uberlevers that needs implementing ...