I did have this issue, too and the new beta version kind of fixed it.
But: I have one screen running in HDPI and 200% scale and the other one with SDPI and 100%. To be specific:
- Surface book 13" 3000x2000 in HDPI and 200%
- Samsung SyncMaster 305T 30" in 2560x1600 in SDPI and 100% scale.
- The Samsung display usually is set as my primary display
The problem now: on the Surface Book all skinned elements are half size and labels are very, very tiny.
I'll test with the internal display only when I have time and also with the internal display as primary display. That might work, but is not my setup for daily use.