If i go into the northern desert and unlock mystral and leave the dungeon by retiering or killing the boss my game does not respond anymore after the rewards for the dungeon are shown and i click continue. i can only se the usual loading screen. it happens regardless of witch class i use and as well in the steam version as in the browser version.
i also had the same crash when i found Dracul in the tundra and left the dungeon after that.
Leaving the level when i have not unlocked a new god works normally-