Thanks for the quick reply! I'm on Windows 10, regular plug and play USB mouse (standard 3 button no frills thing), no issues with other games. My system is: Win 10 Core i7-6700HQ @ 2.6 Ghz 8 gig RAM Intel HD Graphics 530/NVIDIA Quadro M1000M I tried 3.10 and it doesn't have same issue, but the mouse feels slow - sort of laggy almost, like it's slewing rather than being very precise. I also had this graphical error (attached). Also, yea it does seem to be related to the mouse movement. If I move the mouse very slowly, the mouse keeps traveling in that direction. It also does feel a little laggy, like in 3.10.