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 ;-)

JOYRYDE - FUEL TANK

OXSA & DIRTYMADSOUND - Golem

Jefani - It's a Smash Hit

Orgonite (אורגונייט) - Habibi Yaeni (חביבי יענ)

Wiwek & Skrillex - Still In The Cage (Director’s cut) (The Free and Rebellious EP)