I'm having my render scene crash constantly as well. I've set GI details and quality from both 3 back to 2, and even then, it still crashed. Secondly, I bumped up the anti-aliasing afterwards to 8, and about halfway again, it crashed, so I've set it back to 6. I've got the deep version and trying to do a high-res render (1280 x 1024), but all I get is crashes halfway through the render scene. Maybe I should turn off the GI surface details and see if it works, but I don't really want to sacrifice image quality. I'll give a couple of things a try though, but I think this is a serious bug which needs to be ironed out, because no one wants a bug that crashes your render, no matter how high/low quality it is.