Yahoo has been blocked before, but this time I think it's just terrible DNS service. It's very very slow these days. Try hitting "refresh" and "x" to stop and reload several times. It will load after anywhere from 3 to 10 attempts ;)
As others said, their servers aren't being blocked. It's just their domain not resolving in a timely manner. So if it's something not programmed to try many times then it won't work. Apps usually work because they assume an unstable internet connection.
I looked this morning, and pretty much all the official documents came out this way in China after translation. We ended up getting three "copies" of everything. One to give the the consulate. One to keep in China, and one to take to the US. I think they're also included in the brown bag of stuff we give to immigration upon arrival too. So we'll actually have two of everything in the US.
My wife's police report also didn't include the original report. She passed without any problems. I'll double check tomorrow morning to see what's inside, but I think they just retyped it and printed it in a big white notebook looking thing.
Seems to be pretty hit or miss. First time I went there the pizza and hamburgers were great. 2nd time the pizza was terrible, and the hamburger was ok. 3rd time the pizza was ok, but people were smoking inside by the time we left. Guess the no smoking policy is not enforced.