It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all).
We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera

Niautanor: Tested on Arch Linux and in an Ubuntu 16.04 LTS live session.

I am using an AMD Radeon R9 380 with the open source driver (amdgpu).

Please let me know if I can provide any more information to fix this.
Can you try the other driver for Ubuntu 16.04?
JudasIscariot: Can you try the other driver for Ubuntu 16.04?
Niautanor: The article that you linked does not explain how to switch to Radeon from amdgpu and my own research didn't yield any results either.

It probably wouldn't have been a good idea anyway since radeon seems to be geared towards older hardware that amdgpu does not support (at least from my understanding).

Anyway, I also came across this thread ( in the steam forums for the game where someone reported that the issue was fixed in a beta release that seems to be available on steam.

Do you know when/if this new version will be available on GoG?
We just got a new patch on August 9th. Can you update the game and see if it fixes anything?
Post edited August 10, 2016 by JudasIscariot