If Youtube videos do not play reload the page, that's a Youtube bug.
Or maybe now, a few years later, it's a new bug ;-)

The Bloody Beetroots - Warp ft. Steve Aoki & Boberman

Afrojack & Steve Aoki - No Beef feat Miss Palmer

Mojo - Blues

Dillon Francis - Bootleg Fireworks (Burning Up)

Rusko - Everyday