Qt 5.7 Widgets becoming white
Found this issue there, I'm having the same problem in several machines;
Problem happens to me since the very first toplevel widget, the application still responsive, but even opening new toplevel widgets they are all white.
This problem happens to me on Windows 7 and 10, with Intel HD Graphics and NVidia;
Seems to me that this issue only happens on Windows 7 when using the Windows 7 Basic theme, but not when using classic or with aero enabled.
I noticed running the application as administrator solved the problem.
I'm using Qt 5.7 / MinGW.