To help you further - could you please let me know if deleting your graphicoptions.xml file helps.
Go to C:/Users/[usename]/AppData/Local/Divinity 2/Profile
Delete the "graphicoptions.xml" file
No, it didn't... but it resets any set options there like expected. However the resolution box stays empty...
BUTMaybe the problem is a path issue? Before this patch, the path to the Diviniy 2 DKS profile (under Windows 7/Vista) was:
C:\Users\USERNAME\AppData\Local\
Divinity 2 DKS\Profile
now it's - as you said already -
C:\Users\USERNAME\AppData\Local\
Divinity 2\Profile - which was the path for ED (which I know because my old ED savegames are still under C:\Users\USERNAME\AppData\Local\Divinity 2\Savegames - even if ED hadn't a profile folder as far as I remember

)