Hello. Originally I made an object in SketchUp and it was importing into BB3 as the wrong shape. Because it was importing incorrectly I remade the Obj in Blender but the same thing happens... Is there a reason by BB corrupts the Obj, or changes the shape of it? Thanks.
i had same problem i think its going to help you. go to edit mode in blender press A (select all) and then ctl+t and after that export the mesh look if its help you.
Make sue you only have Tris and Quads in your objects. To be honest I think you have to many polygons for such a simple object
also make sure you 'clean up' your obj in blendar to get rid of any loose verts. remove doubles, and decimate the hell out of it!!!!! DECIM8! should be a rock band name. google, 'clean up obj in blender' and 'decimate in blender' should do the trick.