this is what sometimes happen when rendering previews with VPR...seem to have been a non refined frame wich causes a a flicker.
Check end frames.
That´s why I prefered to do some previews directly in viper.
These unstable poor refinement issues has been there all along since vpr was introduced, and continuous on to Lightwave 11.
This never happens in viper.
I rendered this preview out twice, but it was the same the second time.
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