An internal Problem with YouTube's servers has occurred. Thus you cannot access several things on YouTube like the homepage and your subscriptions. Thus your homepage link will have "/?pbjreload=10" at the end of it. In addition you will also likely get a 500 internal server error when trying to access things, if you get that it means that that again the servers are down and you got to try again later.
It sucks but we all have to deal with it sometime.