Thank you for your post.
Our Development and Testing departments are aware of the high DPI settings in Windows conflicting with FileMaker Pro. Until this is changed, use 100% screen resolution.
Hello, sorry, if odd. Your problem seems to be quite similar, but not exactly the same. I experienced problems with FileMaker screen resolution detection. After upgrade from FM 12 to FM 13 and updating to v.4 (Central Europe), Filemaker returns wrong values of Get(ScreenWidth) or Get(ScreenHeight) and also displays Layouts in that wronf resolution. I am comparing to those values, I get in Windows 7 monitor resolution settings.
Namely, working on monitor with 1680x1050 resolution (taken from Windows 7 Screen Resolution settings), Filemaker returns Get(ScreenWidth) = 1344 and Get(ScreenHeight) = 843. Is not strange? If any solution, I would be thankful.