I've seen this before on rigs without a lot of RAM, but this mac pro has 32gb. When rendering large scenes in Maya the CPU load is at a consistent 100%, but the RAM usually hovers around 40%. Despite having 50-60gb of free HD space when I start these renders, the swap files often grow so large that I am warned that my computer has run out of disc space. While I can understand why heavy load applications might cause this issue, I am getting the same problems when there aren't a lot of applications running. Why is OSX at most using 10 out of 32gb of RAM, and instead wiping out 50-60gb of HD space -- crashing various applications in the process? This mac is running on a vanilla version of Lion, so there aren't any 3rd party apps running in the background. Activity monitor doesn't show any rogue processes running amuck -- it does however indicate an awful lot of memory that is not being utilized. Any ideas?