Hi, I'd like to know if anyone else has this problem as I cannot find anything else about it online. In Safari, I visit the ESPN forums, for example: http://boards.espn.go.com/boards/mb/mb?sport=mlb&id=general Something on that page causes one core of the CPU to go to near 100%, and stay there even after exiting Safari. In top it shows up as "kernel_tas", which is pid 0 so of course it cannot be killed since it's the root process. The ONLY way to fix it after it starts appears to be rebooting the machine. On multiple Intel Macs running Leopard 10.5.4 (quad-core mac pro, dual-core iMac, dual-core MBP) this bug is 100% reproducible for me. Anyone seeing the same? (Sorry if it makes you reboot your machine).