Username with Cyrillic charset doesn't supported in 2.1.3...

After update from 2.1.1 to 2.1.3. previously registered users with cyrillic symbols in their usernames can't login to forum. Error message "The user name contains invalid characters" appears... :(
How can I fix the problem?

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no bees - no honey,
no business - no money

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Username with Cyrillic charset doesn't supported in 2.1.3... - Urfin®, 2010-02-02, 10:19
- Username with Cyrillic charset doesn't supported in 2.1.3... - Alex, 2010-02-02, 10:44
  - my description of problem was wrong... - Urfin®, 2010-02-02, 12:44
    - Test posting... - Проверять, 2010-02-02, 13:42
      - Test posting... - тест, 2010-02-03, 14:01
        
        Re: Test posting... - Urfin®, 2010-02-03, 15:33
    - my description of problem was wrong... - Alex, 2010-02-02, 13:58
      - my description of problem was wrong... - Urfin®, 2010-02-02, 15:04
        
        [[:cntrl:]]? - Alex, 2010-02-02, 15:43
        
        Re: [[:cntrl:]]? - Urfin®, 2010-02-03, 12:46
        
        Re: [[:cntrl:]]? - Auge, 2010-02-03, 15:55
        
        Re: [[:cntrl:]]? - Alex, 2010-02-03, 19:41
        
        /[^\w]/u - Auge, 2010-02-03, 20:14
        
        /\w/u - Alex, 2010-02-03, 20:29
        
        /\w/u - Auge, 2010-02-03, 20:38
        
        /\w/u - Alex, 2010-02-03, 20:47
        
        so... - Urfin®, 2010-02-05, 12:49

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Username with Cyrillic charset doesn't supported in 2.1.3... (Bugs)