It looks like somehow a background image was added and it happens to be the same as the category strips.
OK, I just looked at your CSS and under .alt2 and .alt2, you have this for the background url "url(images/dark_vb_v2/gradients/)" That does not look valid to me (the actual image name isn't given) and I wonder if that is causing you problems. The same thing under .panel ("images/gradients/gradient_panel" is invalid)
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