When I open YT video on secondary monitor and go fullscreen then my primary monitor goes black.
GTX 770 with nVidia web drivers 346.02.03f01
Primary screen Full HD on DVI
Secondary screen XGA projector on HDMI
"Use hardware acceleration when available" checked
BTW: It works (primary screen is usable) when playing video using Flash, but I want to avoid this technology since I'm not a hipster.