Quote - Load the obj file into the latest version of PropViewer, click on remove duplicated faces and fix normals and then export it again as obj file (with a new name).

PropViewer fixes all what is wrong with obj file's geometry.

I,m on Mac too bad: An utility for viewing Poser files (pp2, cr2, hr2) and obj, 3ds, dxf and ply files. Stand alone Windows PC application

MacBook Pro OSX El Capitan Ver 10.11.6