Can't add logo or product image to invoice in 2.0.3.1

Please help - I'm loosing my mind.

I'm working to move to OC 2.0.3.1 and am building a copy of my current 1.5 site. (new site is currently [url]http://test-shop.angeldancewear.co.uk)[/url]

There are many extensions in the store, and code files on-line, to do this e.g. here by isenselabs
http://isenselabs.com/posts/how-to-add- ... pencart-2x

The ocmod loads fine, and I get no errors, but no images show on the invoice???

I'm sure that the problem is to do with my site, rather than the code - but the site logo displays correctly on the front page, and order confirmation emails??