I keep getting an error message saying "we're sorry" on the zierer site; is anyone else having problems with their site?

For China visas with PANDA, I don't think we want to be without our passports while in Japan. Can we just walk into the Chinese embassy in Tokyo (or, for example, in Washington DC) and get visas "on the spot?"

Also, do we just need a "single entry" visa or do we need a "three entry" visa as we are stopping in Tiajin, Dalian, and Shanghai?

thanks