I had a bug where I tried to go out of the west gate, but it was like i was running into an invisible wall although the gate was opened. I had to save the game and reload it and i was able to run out again.

Not a bug, but something that could be considered: The leveling speed is just a tad too slow imho. I was in the situation where I finished all low Lvl quests and killed all monsters on my level and all the remaining monsters were 2-4 lvls ahead of me. While challenges are cool, getting onehitted is not.