yeah, please do share with us.
I have the same issues. Looking at the response xml returned in firefox, i can see the Japaneses and the Chinese characters just fine. (our .net application supports displaying characters of all kinds)
However, the x label names are messed up. Not sure what to do with it.
I constructed an xml file manually, in visual studio, saved the file as UTF-8 (however, the only option VS 2005 gave me was "Unicode (UTF-8 with signature) - Codepage 65001, Line endings: Unicode Line Separator (LS)".
Tried with Notepad++ , opened up the xml, I can see the non-English characters just fine as well.
Still no joy. but other than that, i'm enjoying it so much.
EDIT - resolved. The way I manually constructed the xml and back to the javascript setDataURL was wrong. It didn't have BOM in front.