Bad Dock, No Biscuit

Anyone else on Mac OS X Leopard 10.5.1 having this problem? 13/12/2007 17:07:29 com.apple.launchd[123] ([0x0-0x239239].com.apple.dock[3122]) Exited abnormally: Bus error Every so often, while “doing something”, where “doing something” correlates to a mousedown event so far as I can tell, the Dock will disappear and be restarted. It doesn’t do anything fatal, it’s just annoying.