I've been using Snow Leopard for a few weeks now and this is the first problem that I've encountered. For no apparent reason, the CPU spikes and systemUIserver accounts for 90%-100% of the CPU. Some users have reported that disabling the airport icon in the menu bar solves the problem. In my case, however, I have to disable the date/time in the menu bar for the CPU to return to normal. As soon as I display the date/time in the menu bar, the problem returns. Has anyone else experienced this? If so, do you know of any fix? I have no idea what triggered this issue as my MB was working perfectly fine one hour ago. In that time, I was typing in Microsoft Word (nothing else). Thanks for the help.