Wings Screenshot showing hard/split edges.

I'm using PP-2012 and WINGS3d with the ManifoldLab plugin, and I never bevel edges anymore to create sharp corners.

Hard edges now render just as nice as bevelled edges did without polluting the mesh topology.

Actually IMO split/hard edges now look even nicer than bevelled edges did.

My suggestion: You need to split more edges on your prop. Looks like you left a few "hidden ones" out which still confuses Poser. Sometimes it's not immediately obvious which edges all need to be split/hard to get the result you want in Poser.