First at all let me say sorry for the "blackout" of YouTube. This was an unwanted accident.
I'm trying a new way to block YouTube ads and because I have only one test/integration system I happens yesterday that only one part of the new solution was inside the update. This caused a blackout of YouTube.
As I noticed about this I was uploading a fix but it seems I have had still old DNS cache informations inside my router and this caused a false result.
The problem is now fixed within a few minutes. Until the post of @vtec303 I still assumed that Youtube is working.
I hope you can excuse this mistake.
EDIT: working fine now, thanks for sorting this out, cheers.