Yes, it the biggest problem with the 3DS max plugin. You'll have to redo adding the multiple materials to it. There is documentation on adding multiple materials included with the general mesh information, which you can get by downloading the forge tools in the download section of this site (note that all the tools also included in it are obsolete for Rebellion, use the tools in the rebellion install folder).
Also, nice avatar Lavarider. I think you could find a good image of Quadraxis with a background though. 
