My graphics machine is still XP.  Why change something that is rock solid stable?  I'll try that trick after this long render.

Aaand maybe a lesson to be learned is: "If it is an older Bryce version file it might be best to open and modifiy it in the older version unless you are trying to access a newer feature like  instancing.   Hmm   a lot to ponder and too much to remember.  Thanks AS for all the info.