Community Answers
-
Toddo's post in Alt-tabbing Rocksmith 2014 after Windows 10 update lowers resolution was marked as the answer
Ok now that I know the issue started with a Win update, I have found the solution (that works or me)
I used steam to browse the local files of RS and right clicked the rocksmith2014.exe file. Under the compatibility tab, put a check on "Disable fullscreen optimizations" apply and good to go.