Has been coded a modified PnvB version that let work PnvB, Postnuke vBulletin integration, after an Impex complete Import to vBulletin (for example after an import to the vBulletin database of a previous PNphpBB module data, or Invision, phpBB or what else it is (one import allowed). It make PnvB almost complete.
Next scheduled addition will be PnvB for differents database installation, that will let you run together as one a Postnuke and vBulletin installed on different databases.
By the way PnvB tests, have demonstrated that vBulletin and Postnuke are running fine on very big sites using PnvB, with large numbers of multiple connections. Enjoy!