Apple released the Snow Leopard update that is supposed to fix all the problems. I for one haven’t had any problems to speak of, nor have the majority of users, but there have been a few reported that could be serious. Now they’re fixed, one hopes.
Apple’s About the Mac OS X v10.6.2 Update page has the info on various fixes. They also advise using Software Update, which for some users can cause problems.
I recommend that you use the Combo Updater., which will update 10.6.0 or 10.6.1 to 10.6.2. It is not quite as simple as using Software Update, but solves some installation problems experienced by a few users.
MacFixIt has a 10.6.2 update problems report page, listing a few issues experienced by a limited number of users. They’re pretty minor, including no sound after updating, which I experienced. I fixed it by re-selecting the appropriate output (headphones in my case) in the Sound pane in System Preferences.
Others have sorted the problem out by reinstalling the update with the Combo updater, a good solution for any Mac OS update issues.
Some users have experienced a pause at the blue screen after rebooting. Apple worked hard on eliminating this issue, but it still happens for a few users.
Patience is the best solution. Usually after 5 to 10 minutes the system will complete the boot process normally. Usually it only happens once. I’ve experienced this with updates to 10.5 and 10.6 from time to time.
If the problem continues, boot from the 10.6 installation DVD (or an external drive with a good system) and repair permissions on the boot drive with Disk Utility. MacFixIt recommends running a disk verification and repair… it can’t hurt, but is unlikely to help, either. Then try rebooting into Safe Mode (hold the Shift key while your Mac boots). If all goes well, you can restart and all should be normal.
If you can only boot in Safe mode, the Combo updater will most likely solve the problem, which is why I always use it rather than Software Update. Mostly.
If you have the whole update process stop partway through with an error message, try the combo updater. If this doesn’t work, reinstall (Archive and Install) 10.6 and then update. The downside of this process is that some apps may need reinstallation, or need the serial number/registration code reinstalled.
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