vocabolary object get printed in body tag

After updating Drupal from 7.21 to 7.22 and updating lots of other modules, the vocabory objets get printed out above all forms which have taxonomy term tree widgets. All vocabolaries used by term tree widgets appear as first thing in the body tag, just like doing a print_r($terms). But I can't find any applied print_r in my whole Drupal installatión.
As soon as I change to a select box it is gone.
Any idea?