Ah, so I see.  But there are no polygons assigned to those mat zones, so then I would need to use the grouping tool to re-assign the glass polys to the windows and/or mirrors mat zone.  Whoosh.  I'd rather do that in Silo (modeler program).   ;P   Well, anyway, now we know!  ^^

I think your policy is a wise compromise, Victoria.  I sympathize with the content creators who may be wrestling with whether it is worth the time investment (and package complication and file size) to make both file sets.

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5