It don't know what caused the rectangular artifacts in the clouds. Anyone have a clue?
http://www.flickr.com/photos/njeneb/5349100428/sizes/o/
What are your cloud accelaration cache settings and step optimisation?
Did you also change sample jitter and did you render with raytraced atmosphere?
All asked in the order of things I would suspect when seeing this.
Cheers,
Martin
I'll link to the file, hang on a minute.
Ok, here's a link to the file. http://forums.planetside.co.uk/index.php?topic=11566.msg117657#msg117657