Yesterday I was updating my iMAC core i5 (4 cpu core) system OS X 10.6.7 to 10.6.8. After finishing the install and rebooting, I proceeded to start Parallels 6 Desktop for MAC Build 6.0.12090. The launch from the DOCK also launches a thread dock. The dock thread was at 100% CPU (one core was completely consumed). Shutting down Parallels did not solve the problem nor did cache cleaning and rebooting, even to safe mode. I restored the hard drive from my external back up and reverified that OS X 10.6.7 does not have the problem. I updated again to OS X 10.6.8 and once again starting Parallels causes the dock thread to consume 100% cpu. Has anyone else experienced this? It appears to be a bug, incapability with Parallels and OS X 10.6.8.