Well, you don't want to really use the SreeD preview, you loose all the benefits of the hardware acceleration that is in your video card. The fact the the OpenGL preview is more "picky" than SreeD is perfectly OK. Most likely your vertex normals are inconsistent, with some oriented in one way and others oriented the other way. That needs to be fixed. Switching to SreeD is a bit like cutting the wire that goes to the light bulb, when a red light goes off on your dashboard :)

Cheers.

Paolo

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