Hello,
Thanks! I Checked the Bug report and the object, and it turns out this issue is very rare, and not general (it only happens on a few computers). I have tried it on several computers here, but it worked fine for me on all of them (so there's something wrong with your installed version of ARCHICAD or the computer, not the Stairs).
I think what you could try is completely uninstalling ARCHICAD, and reinstalling it, to see if that resolves the issue. If that doesn't help, maybe a reinstall of the OS would provide a clean slate that would solve the problem.
I hope a reinstall will be enough.
Regards,
Daniel Alexander Kovacs
Professional Services Consultant
GRAPHISOFT
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