Problem with the display of some paz files in sections and plans.

Hello,
I have a problem with how aecosim displays the paz-models of my curtain walls. In the workspace a white rectangle covers the forward view, hiding the view of the underlaying floors. Experimenting show his happens when the cut-display style is a cut style with visible edges, but not when i set it to filled visible edges (but then it doesn't unify). It also doesn't show the white rectangle when I turn of drawing symbols, but none of these solutions are preferable. The white rectangles show also when printing (rasterized or not).
I started having this problem when switching to a new version, which is Aecosim building desinger v8i ss6 (08.11.09.866).
Any help greatly apreciated!