Is it possible to change the default colours in the Additional Options? At the moment, the text is white and the page background is a pale blue and it's not easily readable but I can't seem to find where to change this?
This would depend on your stylesheet your using in vbulletin since we use that style. You could try adjusting the stylesheet css class or you would actually need to edit the template.
The adv_gallery_showimage template all seem to use this code