Desktop crashes when I play a video on a browser

This is a bit of a strange one, whenever i play a video on a browser such as youtube or dailymotion my desktop stops responding and eventually goes to a black screen. Ive tried this on Opera and Chrome with no exstentions.

If i close the tab fast enough then all is ok and when it does go to a black screen i can still use any applications i have in the foreground and mouse and keyboard still work but if i close or minimize any application i cant get it back unless i hard reboot

This started only yesterday after i system updated after being on holiday for a week

Ctrl + Alt + F2 still works but the window button does not

Any help with this would be thankful
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