Hi !
Just setting up a scene and having troubles with Global Illumination. First it didn't worked at all until I discovered that the GI Anchor zone effect was much too small, something I never experienced before and took me a couple of hours to find out. Anyway, now it's on and seems to be working... but GI acts very randomly. Works at some place, but when you move the source, goes on and off without any reason. To show my problem, I just did a sphere emitting constant light and makes it cross the area... 


Anyone as any idea what's wrong ?

Thanks for your help !