Hi Pieter I think I've tracked down this issue. Indeed there is a problem with the SQL queries. If the package is used within setups, where authentification works via the username and not via the email address, then this issue occurs. I have fixed packages here[0], could you please give them a try?
Cheers Steffen [0]: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=509280
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