Build 16251.rs3_release.170721-2122 - Win10 x64 Pro
left - 1920x1080 - (DVItoDP) - 100% scaling
Middle - 3840x2160 - (mDPtoDP) - 150% scaling
Right - 1920x1080 - (DVI-DVI) - 100% Scaling
GTX980, i7 4790 16gb RAM
Even though the 2 1920x1080 monitors are set to 100% scaling, the screens themselves appear fuzzy as if they are scaled and applications I know to have a fixed resolution of 1920x1080 only cover approximateluy a quarter of the screen - almost like the 1080p monitor has been upscaled to match the 4K (this isnt the case acording to the display settings, it just LOOKS like that)
Interestingly, If I set the scaling of the large middle monitor to 100%, the issue on the 2 side monitors if fixed but then I have incredibly small icons on the 4k monitor.