Never had a problem with updates to OSX, just with iTunes. Running latest version of Leopard on Intel processor. After installing, now my computer refuses to go to sleep, and half my widgets no longer work, even Apple widgets. Tried repairing permissions, rebooting, and deleting affected widgets. When I tried reinstalling them, the "manage widgets" panel is now stuck in my Dashboard and refuses to budge! Two updates before this one, when I opened iTunes, I lost all my preferences and my playlists. Dammit!