#1
Windows 10 is very interesting indeed.
If you've upgraded to win 10 and only "refreshed" it instead of a clean install then there might still be broken drivers floating around.
TF2 is also very interesting and sometimes produces that "can still hear people, maybe even talk but can't see anything" bug when you have a browser with video hardware acceleration (read: any browser) opened in the background.
Or maybe just glorious win 10 DWM.
#2
Some day I will get the most +frags in a PC thread again, but today is not that day.