Boxes as noted above by TheNewTVRepublic, leading to some speculation that we were seeing a repeat of licensing related blocking that once shut down access on Popcorn Hour hardware. Fortunately that's not the case, as the official YouTube account just tweeted out a notice that it's only a glitch which it is working to address "quickly." We'll return to DEFCON level 4 pending an actual fix, but until then the latest series of Vote 4 Bieber My YouTube entries will just have to wait.
Update: And just that fast things are apparently working again. Return to your normal schedules citizens -- nothing to see here.