I thought I'd finally do a real project using 1.6 and the first thing I noticed is that the IR restarts randomly and often, even when I'm just looking at it, doing nothing. The other things is that regions are ignored, the whole scene is rendered. Are these known bugs?
Edit: I doesn't restart if I just let go of the mouse and leave it, but when I move the mouse around, it happens (even if don't click anything).