Created attachment 121443 [details] screen shot Windows 10 - graphics are scrambled (mostly black with some white zigzag lines). Have to run in it Vista compatibility mode (Win7/8 compat-modes under Win10 also mess it up). Equipment: Dell Inspiron (2-in-1) I5-6200U (7000 series) Graphics card: Intel HD Graphics 520 See attachment.
Do you have OpenGL on ? Else try it with OpenGL disabled, Tools -> Options -> LibO -> View -> uncheck 'Use OpenGL...'.
Well, that's a known issue, related to recent Intel driver update. As a workaround you have to disable OpenGL by either merging this registry fragment: attachment 118060 [details], or following the procedure from Bug 95639 comment 10. Should be resolved in 5.0.4/5.1. *** This bug has been marked as a duplicate of bug 95639 ***
I downloaded 5.1 RC1. It fixed the problem.