Hi,
Sounds like a rebuilding problem. Next time you see this happen, please try doing a 'Rebuild&Regenerate' (ctrl+alt+shift+R). This might regenerate the geometry and things might appear.
Also, if you have a certain set of steps that triggers this, I would really want to try it myself to see if it is caused by a bug. Could you send me the steps to reproduce this along with a PLA version of the project? (you can send them in a private message)
Thanks,
Daniel Alexander Kovacs
Professional Services Consultant
GRAPHISOFT
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