I beleive
vbseo has code to make sure their program does not interfere with our program or its code as long as you do as they instruct things work fine.
I think you will find if you disable
vbseo and any htaccess and run a normal vbulletin and photopost your spider urls in the gallery work. If so then you need to discuss with
vbseo what code to use to disable their program on the gallery side of things.