I purchased a retail copy of Diablo III in Traditional Chinese.
Here are my errors:
If I try to play in Traditional Chinese, I get error 12, which I believe others are receiving.
If I change my language to English, I get error 84:
"The client does not match the account's native language.
Please use the game's original client. (Error_84)"
Before I bought the game, I read online that I would be able to change the language interface to English, so I would like to resolve the error 84 issue.
Either way, it is currently impossible for me to play in either language.