I've probably found a solution together with one of the Orcish Inn players. Can you please try to change the graphics settings of your computer so Orcish Inn is started as a "High-performance NVIDIA processor"? Here is more information on how to do that:
http://nvidia.custhelp.com/app/answers/detail/a_id/2615/%7E/how-do-i-customize-optimus-profiles-and-settings
Please let me know if it worked!