I guess dennis beat me too it ... while I was making a pretty picture
The wire for the hanging shape is a line ... 2 points. I changed colour to red ... and have indicated it with a green arrow
Never tried that loader you are using ... but I'll bet it chokes on that line.
As Dennis points out you have used a lot of polylines which may also be causing problems. The red arms for example produce a nightmare if you export out to vrml ... looks like you drew the side as a polyline and extruded it. There are better cleaner ways to make objects like that.
griff