I've just started playing Pillars of Eternity and there is a strange game behavior while characters are moving. Screen become dark-grey with transparency, so you can see some parts of background. Here is a screenshot http://my.jetscreenshot.com/25635/20150327-ctum-1344kb There is also graphical artefacts appears, see triangle in the right bottom corner at screenshot and square at the left top corner.
It does not matter what screen resolution, V-sync and other graphic options I choose.
The issue happens in combat mode as well.
Just in case my video device is GeForce 9600 GT, driver version 9.18.13.4144 (updated on 03.02.2015)