I have two characters at level 3.
1.after I applied the GOG update (FYI GOG said there was an update, but the filenames were iidentical original to new). My loot in the shared chest was gone.

2.I entered dungeon 1 to rescue a team member and one of the rooms failed to spawn with a door leaving my character stuck on the level.

otherwise fun game.

about problem 2 i found it once on the fist dungeon, so it was vexing but not dramatic.

about the first problem i think it's not an update problem.

I installed the game 8-9 hours ago, and never updated it (no gog galaxy on linux), played ok yesterday and today when i started it again the common stash was empty, a repeatable bug even, just put an item there, exit the game and there you are, no more items in the stash.

for problem #1. That's good it's repeatable, so hopefully it will be fixed soon.
For problem #2, yeah, since it was in the first dungeon, not too big of a deal

on steam there is a patch that supposedly fix the stash problem, and a dozen others, hopefully will be on gog soon.