Unwrap/Wings problem

Miscellaneous Forums/Content Creation Tools/Unwrap/Wings problem

THIS IS DRIVING ME NUTS!

The Unwrap people blame Wings and the Wings people blame Unwrap! HOPELESS!!!!!

If I extrude the faces in Unwrap it seems to screw the 3ds.

Can someone please suggest a decent modeller that will allow me to create a ERROR FREE 3ds file of some stairs like the above?