Many people in the Steam community have been having problems with the Windows 10 AMD drivers, while people running nVidia graphics don't have this problem.
Here are two discussions people have posted:
Windows 10 Compatability? :: Source Filmmaker General Discussions
So is there any solution to the Windows 10 problem? :: Source Filmmaker General Discussions
I'm coming here to ask if there is anything I can do about this problem, because many people are having it and it's really difficult to work when your screen looks like this: http://i.imgur.com/sWSkyZt.jpg
If you can help, please respond.
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