Well, I tried rendering on P4 and it came out ok. The image on top has ambience turned up pretty high and the image below it has ambience turned up even further.

So, it seems to work fine on P4. I guess those pesky material nodes are getting in the way again. I can't believe P5 won't let you modify them YET even though that program is about, what, two years old now?

Sorry. I can't test P5 right now. My daughter is hogging my other computer. But I bet that is going to be a whole other can of worms, as Ockham suggested early on.

(memo to self: learn to read threads)

===Underdog===