I had a lot of problems with reversed normals in Max until I figured out a procedure. Normally (!) if you mirror anything in Max Poser treats the normals as reveresed, but Max doesn't, so if you reverse them in Max they are correct for Poser, but not for Max. The answer in Max is to attach the mirrored part back to the source part, then detach again if required. I don't know if that will work with other programs.