The run is dead. Look at this shit: I select Great Cleave on Level up...
... but my character has no such Feat afterwards. It has 2 Cleave abilities instead of Cleave, Cleaving Finish and Great Cleave.
Maybe it's just a visual bug but I cannot play like this. It's driving me crazy.
On the other hand restarting the game made me realize that the difference between a mediocre build and a specialized build is significant. I'm playing on Challenging difficulty mode and I've done the first chapter in a couple of hours (much faster than before). I only had issues with the big centipede from the Old Sycamore mine and the wererats but I'm pretty sure they were put there for lolz.
Anyway, I will have to stop playing until a real patch is released because otherwise I will lose my will to play the game. The situation is pretty retarded: we have two definitely great games in Pathfinder: Kingmaker and Insomnia: The Ark and both of them are unplayable because of bugs.