Similar issue here. I have a dark background in my forum, Shaolin Temple Perspective - russbo Forum / Library, and the background of the photos is white, instead of, well, I think transparent. where would I alter that?? I can't find a panel surround css in any of styles.
And if you follow that into the Photopost section, that same background appears (it won't match the dark styles). Must be some background setting in some css somewhere, but I can't find it.
No, that's not it. I went through all the stylevars that might be it, and I can't find it. Looking at the plugin and the template that is formed really doesn't show how this photopost addon to vbulletins frontpage comes up with its background color. I'm baffled....
(I asked this here, which is probably a more appropriate thread. Should have put it in this mod corner thread initially)