I seem to be in a problem related to this thread.
I new I had it coming.
I recently switched my user database from phpBB to vBulletin.
Fortunately I only have 6 people who have posted photos but for 4 of them the userids don't match.
I changed the userid in PP photos.userid to match my vB userid.
Then all I saw was no thumbnails.
I ran scan photos and that only deleted the photos.
My other thought is to swap userids in vB and then I need to change all their posts.
Is there anything I can do besides reupload the photos?