I got it to work by changing the first 2 lines:

g object1
o object1

>>

mtllib objfilename.mtl
o objfilename.obj

You could explain this better than me... but it looks like Wings needs some sort of reference to a material library.

Hi lee - that material library thing is an optional thing that can be specified inside of an OBJ file, definitely a program is not supposed to crash if it is missing...

If you can include that information (and maybe both sample files, the one that works and the one that does not) when you send the Wings developer a bug report, it would probably help them.

- Michael