This doesn't seem related to the below posts so I'm creating a new one. Whenever I disable shadows in the P4 and/or Firefly renderers, I can never get them back again until I start a new document. I've tried different light sets and shadow settings, nothing works. During render, what I think is the "Rendering Shadow Maps" message appears for a split second, but I get no shadow. I do not have "save shadow maps" turned on. Any ideas?