@garsdaledesign, Thanks for the reply. I think it's a memory bug too. Badly, when this issue has happened I saved the scene, so even I restart CityEngine the error is still there. Fortunately, I do a backup of the file, I didn't lost all my works... @matthiasbuehler I can't reproduce the issue again from a new scene. But I remember it happened when I drag a rule to a shape. By the way, the file will save the error into it? Cause I saved the file, when I reopen it the issue is still exist.
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