Yep, 10.4.6 totally screwed my 1ghz Ti Powerbook. I tried to dl the update, first i got the install error saying it moved the update to the trash etc... Then i tried redownloading it, it gave me a different error (i believe the networking error). so i though whatever ill just reboot. but first i tried to run isync to backup my contacts and calanders to my phone. no go. isync would bounce once in the dock and then just stop/not open. did that every time i tried to run it. all while i was running all my ther apps fine. hrmmm... so i try to log out. it logs out and goes to the spinning spokes and just sits there for a good 3-5 minutes, wont go to the login screen. i reboot, and now it sits here at the apple logo and spinning "spokes". I guess i havent let it go for more than 10 minutes yet but this is pretty discouraging already...