Thanks Mara, With the urgency of the issue I needed to find a workaround so I tried stripping out the Plant Factory trees in an older version of LumenRT which worked. I suspected that it was a Plant Factory problem (as described in this thread - /f/343228/t/129630). Back in LumenRT 2016 I encountered additional problems, including this one - /f/343228/t/129767. The only solution was to start from scratch (which took up my entire weekend!) I'm hoping some of these basic functionality issues with LumenRT will be addressed in the next release. Max
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