Greetings, A word of warning, don't import thing from BoboPOS, they won't work with ZODB3. So, instead of: from BoboPOS import PersistentMapping do from Persistence import PersistentMapping do this also for Persistent from Persistence import Persistent I think this is what is effecting Tiny Tables, because Tiny Tables does a 'from BoboPOS.PersistentMapping import PersistentMapping'. -Michel