Fix Login Problem on PP

[Vman]

Here is the run down....I log in to the vB site, then I click a pic from the preview, it sends me to the gallery photo, but a page come up to log in again for PP, I attempt to, but when I press the submit button I get a error page, as if a link or re-direct in a php file is not correctly setup, How do I fix this and where...

Thanks!