I’ll have to admit I’m not sure what your asking - your message is a bit confused. We are going to need more detail to be able to help though - its unclear how you have multiple materials on this mesh. How about you describe exactly what you are doing? As for that bug, I’m not sure what is happening there, but it really shouldn’t!
I tried to export a blender file with a simple cube and a not default material; the egg that was laid had a different material <Metall_ColoredChrome> and not the material I wanted to export.
After reinstalling ChickenR56 I got rid of this part of my problem but still persisting is that pview opens an empty.egg and tells me in the Blender console:
Ah, old versions shouldn’t be used anyway - glad its not a current bug! How about you send me the egg file? E-mail is thaines@gmail.com - I can have a look at it and figure out why it doesn’t work. Before you do that though just make sure the filename is only using ascii characters - I don’t know if Panda has support for other character sets for filenames.