I just spent part of my lunch hour ( my time planet-side) tweaking my render settings and rendering that 1002 Nights Party Lights scene again - NO GO.. 

Sickening - runs up to 99 per cent of the render then hangs, hard disk light lit up continuously, indicating a fatal loop somewhere - 3Delight render engine.  I switched to hardware rendering and guess what - instant bad hang.

Cheech.  Dustbin time.

Eternal Hobbyist