You will probably find that the Archicad objects have a plan fill - either white or screen colour pen.
The objects you have from 3D warehouse probably don't have this plan fill.
If they do then in the parameters you will be able to adjust the fill type and pen colours for the hatch and background of the fill.
Because there is no fill (or the pen is set to transparent) the display order will not do anything much.
Barry.
One of the forum moderators.
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