Since Patch 1.11 I have been having these polygon HUGE bugs on some houses. It is not my GPU, because this didnt happen before.
This is in the swamps right after you meet the kids and the old woman after you follow the cookies or whatever is called (I am playing the game in spanish my native language).
It also happens in one of the houses where you first meet Letho. The house where you get the key.
660ti MSI Hawk
Latest Nvidia drivers, Windows 7.
Gamebreaking bug: I can't climb any ladders. Not sure if this happened after installing Hearts of Stone or patch 1.10, but in my game Geralt just does not react when I press the "E" key. He just stands there. I am stuck in "Open Sesame" quest from HoS because I can't get out of the basement.
Minor bugs I've also encountered in HoS: game crushes during cutscenes with Shani and some graphics won't load.