Mac. All crashing happened in the VM. I'm not worried -- demos have problems, and the full version has a bug fix out already. I am a little pissed that the upgrade is the same whether you go from C4 or C4Pro. The only reason I got "Pro" was to stay on the pro side of the upgrade path. So I wasted a few hundred bucks there... Still, the ability to use improved edge tools on one of my pre-fitted, pre-mapped meshes is a BIG selling point for me. I've finally got a working method that works for me, and Carrara is on the way to supporting it fully. Now if the next upgrade just includes the UVtools a bit!