Cupb missing in dwg Import

[M.A. Winterton]

When I export dwgs of Ca floor plans and then import them back into Chief, the base cupbs are missing. They are their but are white filled with white edge lines. I use white backround, the cupbs when exported aren't set as white but brown, so why are they importing as white. I had this problem in version 9 aswell but not previous versions. I import the floor plans back in and block them but the Kitchens are always missing ! Does any body else get this problem ?