I got rid of the :2's that were on the 1st exported OBJ file, and unchecked all the boxes when importing again. Once imported, I checked on the Group Editor, and all body parts were there except the ones I didn't export, and all the polygon groups were correct.

But when I export for the 2nd time, the OBJ file has only 1 object, called Apollo-NewNeckAndHead. There are no other polygon groups. I tried several combinations of the checkboxes for the Exporting Options when exporting the 2nd time, and it always give me only 1 polygon group. It does export all the material groups though. So this explains why I was getting an invisible figure at the end. Though I'm still troubleshooting this and not sure whats wrong. I'm trying 3D Studio again now and editing the OBJ file on Notepad++ to see whats going on.