Originally Posted by MikeFix:
I've surrendered on using XP4 for fire as I don't have any 3rd party renderers and it doesn't support GI with C4D's standard and physical renderers, then comes the insanely slow preparation times. Hopefully they'll resolve these issues in a service update soon. I find it rather troublesome that these problems don't exist with 3rd party renderers.
Both c4d and Cycles are due service packs soon. The Cycles update is supposed to be significant. Let's see where this stands after those are issued.