Collada Mesh Export with Multiple Textures

[mickeydsc]

I'm seeing some issues with following the steps. I am able to select and UV map the first face group of my model (I'm making a proa-style, triangular sail), but after I make it external, I notice in my Geometry view that that face group's faces are invisible (see second attachment) ...

More of a concern however, is that when I follow the steps for the second face group, it puts the second face group in the first's texture file and UV map (see first attachment) ...

I also tried creating separate materials, then selecting the face groups on the model, and RMB on the material > Assign to Selection, but that didn't get me past the combined texture file.

Can anyone see what might be the issue?

Thanks again for everyone's participation in this discussion.

EDIT: Still learning how to post in this forum - the attachments are opposite in the order I added them, but I've updated the notes above