The two softwares were chosen specifically as they were meant to integrate very well.
The report of the 'unregistered user' is I guess a factor of the integration being such that all the user details are derived from the forum's user database table. I guess that an additional parameter needs to passed on the transition from Forum ==> Gallery.\
When the forum and gallery (later) was setup Chuck and Jim Hale (Data1 Systems) had a discussion about the technical details. All very painless from my perspective.