Permissions integration works well out of the box with the current versions of PhotoPost (6.0) and vBulletin (3.6.8 PL1), but the very useful plugin,
Add PhotoPost Pro to each forum was broken likely either by PhotoPost 6.0 release, or the release of vB that prepared for blog integration (3.6.0 or 3.6.5, I forget). If that hack is installed on the latest vB, it'll disable Forum Management and thus it's impossible to make the plugin/hack do what it's supposed to do.