Rule of thumb,
Always do multiple restarts after installing an Apple OS update. I usually do so in the following pattern after clicking restart in Software Update:
1. Let it boot to login screen then restart.
2. Let it boot again to the login screen then restart (the boot time now should be the regular one, not the extended 'i've just installed an os update' one)
3. This time log-in. Let the machine settle and load everything without opening anything. Then reboot.
4. Run Disk utility & macjanitor - then reboot.
Now from this you can deduce that either I am paranoid about rebooting my macs - or that I love the mac 'gong'
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Updated 15" 1.5ghz Rev. B powerbook, Powermac G4 & 12" powerbook - all smoothly all with no problems. Granted perhaps because of my multiple reboots I did not encounter any problems with bluetooth or airport or anything of that nature...