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 ;-)

RYSY - Father

KAS:ST - 75ZOO

Pitch Black - Without the Trees (Tom Cosm's Itch Twitch Remix)

Radioactive Man - Sonic Portal (Pitch Black's Magnetospheric Multiscale Remix)

Effective Force - Fish (Kathy Pacific's Fish Mix)