Never heard of this one and we have many, many sites using international UTF-8 character sets. What do you have the username format set as? Can you try changing it to 'email' to see if it works that way, which may eliminate some of the foreign characters from the user's name when generating the username.Another problem i encountered is with Facebook Users with Greek names. The Auto registration process is skipped and the Registration Form is loaded with an error message of "Please enter a username". Even though the username is filled in the registration form the register button is not doing anything.
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