Hi, This is pretty global problem and hard to pinpoint, but ever since I installed leopard I need to reboot the computer at least once in 3-4 days. With Tiger I could leave machine on for weeks, when some app like firefox hogged memory I just closed and reopened it and everything was ok. Now I have a 2.6ghz MBP with 4gb of memory and machine literally begins to behave nasty after couple of days, apps hand, finder beachballs on random places, apps do not quit properly and must be forced to die and so on. System ressources like physical memory, swap, disk, cpu are almost unused, still the problems grow. Is this something others experienced with Leopard? I hope 1.5.2 will bring some relief.