Hey Karl,
We have looked at your files, and found that the problems are caused by Stair Stringers and Railings with Complex Profile shapes.
The issue is that at some point there was a Complex Profile set for these elements, but since these profiles must have been removed, because the profiles used in them are "MISSING". You can quickly fix that for yourself.
In one of the Stairs, the Stringers are turned on, but they are not visible in the 3D model anyway. If you really don't need them, you can just turn them off.
In one of the Railings, the Rail End of the Toprail is also set to Profiled with a Missing Profile, but it is set to 0 length anyway. Here you can just change the Rail End to a non-profiled type, or replace the Profile (it doesn't matter, since it is not visible anyways). I have attached pictures of these.
Of course, just because the Profile is Missing, it shouldn't use random Profiles in random Positions when Hotlinked. This is a bug, so we are working on solving that issue.
Kind Regards,
Daniel Alexander Kovacs
Professional Services Consultant
GRAPHISOFT
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