Help - Windowelements/FloaterFrame

[TheStarGazer]

Hey guys. I'm editing the basic windows for the entire game atm. ive hit a snag though. in the floater frame i get a black background. though i only have two elements there. BKG and FRAME which are correctly referenced to my .dds file. each part checked.

just it gets all black in the background.
whats this window actually used for? does anyone know?