Hotfix #3 has brought a new hang, in the second part of the end (when you need to use the object to crash the nautilus) when you trigger the last 3(4?) imps to spawn after defeating the first set of 3 there's a soft lock which stops gameplay and makes it impossible to progress past the prologue into act 1. This has happened on 2 different characters, on several different saves, regardless of whether or not the 2 additional cambions have spawned, regardless of whether or not the mindflayer is alive or dead.