After many disappointing hours with this problem, I just found a solution (if not an explanation).
Changing the font of the query results did not affect my system (Win 7 Enterprise, 64-bit).
After much searching, I discovered this: My Chinese word suddenly appeared like a square box
In short: create a new Windows user account, then log in as a user - you need to make sure that your Chinese characters are displayed correctly. Now log in to your original account and you should find this, now Chinese characters are also displayed.
Thus, the creation of a new account leads to fixing behavior for both (perhaps all?) Accounts. Now - who has an explanation?
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