I tried again today, this time with items I bought from Cornucopia but downloaded using my Vue 5 installation and transfered to Vue 6 (small house and wagon shed).   I was able to work on the scene, save it, open it, add more stuff, render, etc.  Used 2 eco-systems for a total of 22 million polygons - worked perfectly.  

Will go back to the simple scene and try to pin-point what the problem is, but today was more just playing around - it was a lot more fun without all the crashes!

LVS - Where Learning is Fun!  
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