I actually have 55 registered users on phpbb forum and 61 resulting on photopost... why is there a difference? The two are perfectly integrated and it has worked well until some time ago. How do I sync the users?
That's normal. On my phpbb3/pp pro install, phpbb3 shows 406 members and pppro shows 411 members. The reason for that is phpBB3 only counts the number of active users. The old version just counted everyone. I didn't check the code but I assume PP Pro just does a count of the users with no check to see if they're active. Chuck will be able to verify that.
No action is necessary, there is no "synching" of the total number of members.
Photopost counts the number of phpbb3 users except BOTS. So that is probally your difference we dont check between confirmed or unconfirmed registrations. We do however restrict the bot count.