If you are trying to be signed into both applications I suggest you do the following.
In
vb admin sign in and set cookies like this.
cookie path /
cookie domain .loriwileydesigns.com
I would suggest then go to Photopost admin cookie settings and make your cookies like this
cookie path /
cookie prefix bb
cookie domain .loriwileydesigns.com
That should help your login issues. As far as some user being an admin we get all user info from the forum so I would suggest you check out this user in your forum control panel and ensure you add them to the proper usergroup they belong to. vbulletin should have tutorials on their site on how to use their software. Since your integrated with the forum all users and user actions happen over in the forum not in photopost. In the gallery you only assign permissions based on usergroup.