So, if I understand correctly, you are on Story 0 in the Floor Plan Viewpoint. When you show a Worksheet as Trace Reference, it is displayed correctly, but when you try to show Story -1 as Trace Reference, nothing is displayed.
I am assuming that
a) there are elements in Story -1, and
b) that Story 0 and Story -1 do not have the exact same elements, so elements in Story 0 completely overlap elements in Story -1.
You can actually check this by using either the "Temporarily display Reference" command of the Trace Reference Palette, or the "Switch Reference with Active" command to check whether there is anything on Story -1 to be displayed.
Another thing you may try is to update the graphics card drivers. This is just a shot in the dark, but it may be possible that the driver is causing this display problem.
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