Divinity 2 - The Dragon Knight Saga, Steam version
Divinity has run perfectly on my setup until the patch. After the patch it will now drop to 1280x720 and the only resolutions available are that and 640x480.
I have two monitors, my primary that I play on runs 1920x1200, the secondary 1600x1200. Both monitors have a 60mhz refresh rate, and I have tried both with and without 'User Interface In Desktop-Resolution' checked.
If I disable the secondary monitor and rerun the game it works. Its a workaround but very annoying and again, it worked flawlessly before the patch.