Well as I am clearly showing with a link and login Photopost Pro has not a single issue with vbulletin 3.7
We dont use any vb
stuff that does the security stuff. All our stuff is handled in our own coding as we only load the header footer and style in vb
I would suggest you turn off your hacks and plugins and see if the issue goes away.
You might also want to post a link and login here.