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 ;-)

Dub & Run - High Elephant feat. Elephant Man

Teef - Out To Lunch

Son of Kick - Playing the Villain

Crystal Fighters - Xtatic Truth (Original Mix)

Cubic Zirconia - Night or Day feat Bilal (CZ Club Mix)