Another month?

Hmm, youtube just reappeared as mysteriously as it vanished a few days ago. I found a site for extracting clips to files (because there's no web access in the classrooms*) and grabbed a few things for a colleague, then the following day, there were blank spaces in many pages where the video clips ought to be. My question is: was it blocked in the whole country, or did I just do something stupid that prevented flv files from playing? And if the latter, how would changing out the theme for Firefox (the only change to the system) fix things?