@ Voight-Kampff: Do you have Logitech G9 mouse, like Deviate and nvali do?

@ all: It will be of great help if you try using different mouse and send results along with dxdiag file through our support page.

http://www.gog.com/en/support/contact

The link to our support form is on the right side of every game's support page, under "Contact our support team". That should work fine.