unity ios internationalization: chinese characters displaying as boxes

I am using Arial Unicode MS on mac for the font and display the string in the appropriate language according to the language setting of the iphone. The problem is that for c$$anonymous$$nese strings, I get boxes instead of characters where the text is supposed to be displayed.

T$$anonymous$$s is both in gui.label and guitexts.

How can I fix t$$anonymous$$s? What am I not doing right?