Cubecart version 4 tweaks

I have more or less finished implementing a Killer Skin in cubecart 4 with some css changes for colours and style. I have a few niggly bits that need finishing that I can't do myself. Categories - When you click on glass you get the sub cats but they run off the white background at the bottom. Images - same image is used for all products but the thumbnail is not showing. I used the export feature in admin to add the image and then imported back in again. The thumbnail is in images/uploads/thumbs which was created by the program when I re-added the first product manually. (For now I have replaced the image not found as a get round) Text colour - showing black on black as per the boxcontent settings in layout.css. If I change text colour to white the price disapears when you view products in a category, because it is a white background. (for now I have changed this to red but not ideal) I would prefer a coder who is familiar with cubecart. The site is <[login to view URL]>