Problems with UV Map Segmenting

[Gungo]

I'm very new to Wings 3D but I've used various 3D modelling software in the past so I've caught on quite well. I'm just running into some problems with UV mapping. I've read everything I can find on UV Mapping with Wings 3D but nothing helped.

When I select my model, right click and go to .UV Mapping, why does it only sometimes show the AutoUV Segmenting window?
The window only appears every time when I use a model that I made in Wings3D, but if I try to do the same thing on a model that I imported, it skips the Segmenting window entirely and I get this thing in the window on the right:
http://oi60.tinypic.com/25ow0vk.jpg

I'm assuming it has something to do with the fact that I imported the model as a .obj. I just don't know what I'm supposed to do about it. The most mysterious part I find is that I got the segmenting window to show up on the model once, but now I can get it open again.
Any answers would be greatly appreciated. Thanks