Check your users_preferences tables and see what's in there. There shouldn't be anything.
Are you sure the datamodel loaded right ? Did you dump the output of the loading to a file and checked it for errors ? That's pretty much the only way to check for errors, for as when you are loading it it goes by too fast.
Make sure all your datamodel was loaded right. If some trigger or plpgsql function was not created, then you'll have problems.
