It is not outside the realm of possibility that Github itself had a problem. I've seen instances where "git fetch" pulls refs but not the objects pointed to by

It is not outside the realm of possibility that Github itself had a problem. I've seen instances where "git fetch" pulls refs but not the objects pointed to by the refs, then it gets cleared up an hour later and my builds suddenly start working again. It's almost pure happenstance that Linus's idea of Git being distributed lent itself to the Cloud hosting business model. And the hardest thing to teach is the mental mapping of local and remote refs. So this isn't just Git being too complicated. It's a confluence of several factors that would never have been possible if Git had never happned.