I have done exactly what you said and changed the style to Darkness2, it has improved my vbGallery slightly. ie part of the skin is showing but its far from being correct, any further suggestions please.
Yes under your global style elements in that style admin for darkness2 make sure your using full url to images not relative urls. Then your images can be found. remember your style is very dependent on finding custom images that only exist under your forum directory not gallery directory.