Hi Brian,

<< Formation takes about 30 seconds +/-......exception occurred, line 528>>

That's odd...For me node generates result in 8 seconds, without error message.
I wonder if someone else might run this nod file and see if issue is repeated:
http://moi3d.com/forum/index.php?webtag=MOI&msg=8663.14

<<and geometry vanishes when node editor window is closed>>

That's true for all (or most) nod files. You need to click "Apply" button to bake out geometry, otherwise it is a preview only.

<< I need to learn meaning of wire colors...>>
Greenish = numbers
Magenta = points
Yellow = objects

James