A bit disappointing then. The vast majority of things I change and need to check how it looks after the adjustment will require re-calculating the radiosity. And by the time I figure out if I need it on or off I might as well just leave it unchecked always. They really should implement it automatically. Surely the program can keep track if I changed lights, camera, position and set a flag to ensure radiosity is recalculated (or at least send the user a warning). Shame, what a waste of a good idea :(

"I paint that which comes from the imagination or from dreams, or from an unconscious drive. I photograph the things that I do not wish to paint, the things which already have an existence."
Man Ray, modernist painter
http://artpearl.redbubble.com/