Material property changes to default

I have had an issue with my sheet metal parts.  I set the material to the desired type, all configurations.  All is well when I'm working on the part, but when I save it, close it out, and then reopen the part, the material has gon back to the default "Material "  Has anyone else seen this issue?  I am using 2009, SP2, 32 bit.

Thanks

SolidworksSheet Metal