imap mailprocessor only works at the first run (before the civi-folders are created)

Hi,

im testing the great new php mailprocessor.

the problem:
The CiviMailProcessor only works for me at the first run - when the civicrm-folders doesn't exists.
If the folders exists, the script stops after printing the mailboxes "Inbox mailboxes found: [...]"

What i've tested:
I've commented out the two "createMailbox()" lines in the Imap.php to test.
"// if (!in_array($this->_ignored, $boxes)) $this->_transport->createMailbox($this->_ignored); "
"// if (!in_array($this->_processed, $boxes)) $this->_transport->createMailbox($this->_processed);"

After doing that, the script works great (if the civicrm-folders exists ) !

I'm a php-noob so i don't know how to detailed debug this problem.