Hello again SuperDuperYeah,
So I attempted to import the model you linked and I was indeed not able to import it. I pulled the mesh into Max and deleted the verts on the back of your mesh that seem to be extra. See image as reference:
Re-export your mesh being sure turbosmooth option is unchecked in the export options.
Importing your mesh should work instantly now. What was happening is that the engine was attempting to map those verts and was getting caught in an endless loop. I hope this helped!