Christian,
  I too, have faced this problem while upgrading from 2.0.21 to 2.5.7
  The 'invalid utf8 character' may be only a symptom of the problem.
  My only guess is around the following -
    - the database was using 'latin1' as default charset, RB 2.5.x expects 
'utf8'. So some mismatch/warning results.
    - the database was using 'MyISAM' with which the evolution fails; one 
has to change the engine to 'InnoDB' before evolution.
  If you want a sample diff, I can possibly produce it - let me know how, 
please give me step by step instructions.

  Bottomline, this upgrade has not yet been successful for me.
  Any help is appreciated.
  Thanks

Koushik Roy.

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