Yo something I noticed in 4.9 (free version of course). In the caverns dungeon (the one in the bottom of the giant crack on the ground), when you fight an enemy near to the boss's location you have a very high chance of cliping through the ground. It doesn't softlock you, since you can use the "Emergency escape" item. I don't know if you stats influence this (when this happened i had around 2000; 3000; 5000 in the "Size" stat)
Another thing I noticed is that, if you save in a dungeon (could be any of them), quit the game and reload your save, you'll be in the """cathedral dungeon""" in a really high floor. When I discovered this on accident I showed up in level 100.
Besides the game is A WHOLE LOT more stable now, I can actually do stuff without fearing a game crash.