There is a problem with the new volumetric clouds -- depending on scene configuration. This was acknowledged by Eovia's folks after I sent them a scene with V-clouds that was having memory allocation errors. I also noticed that it seemed there was some sort of weird network render time-out(?) when rendering with high quality V-clouds -- took a very long time for the render to start, and when it did, I would be missing the V-clouds on one or more nodes.

Eovia's team seems pretty much on top of things, as they seem to frequent Eovia product forums to see what's going on, so they likely know about this problem? Still, I would definitely sent Eovia an email detailing the problem even if you don't send the file.