I got this error after doing an import from vBGallery. I also lost all users when I did a db scan to fix medium size images.
But, My Photos gives this message:
You do not have permission to view this category.
I've checked all permission settings and they are fine, so I can't understand why this occurs.
I also wanted to use vBulletin's registration system rather that Photopost Pro's, but where do I find the link to change this to point to vBulletin's registration?