The hidden geometry was indeed off, now it works perfectly. Thanks!

Yes, the model is automatically turned into a group which, as far as I know, can not have multiple textures or colors applied to. I forgot to mention that I've already done what you suggested (edit group) which is were I noticed the problem I described in my previous post. I've also tried "explode" but with the same result.

A really useful plugin. It helped me with creating a highway interchange.

But what if I want to paint the created shape in more than just one color? Since I'm using this plugin to create a road ramp I really want to be able to paint the sides in different colors and textures. As it is now I can't since all the sides of the thing are treated as one. If I click on the left side for example, the right, top and bottom also gets highlighted. Is there anyway to solve this?

By the way, I'm using this plugin together with the bezier curves plugin by Fredo 6 if that matters.