This issue should be fixed by a previous patch, but if not, then follow these steps (assuming that you're running on an nVidia card):
- Open the nVidia Control Panel and click on "Manage 3D Settings"
- Then add orcsmustdie.exe
- Scroll down until you find "SLI rendering mode" and set this to "Force alternate frame rendering 1" and accept the warning that pops up
- Click Apply