
Basically (for me) the Mac OS X 10.4.8 update corrupted some or all of these files. Apple's tech note on this issue didn't make sense: resetting the router didn't change the behavior of any Macs that didn't update to Mac OS X 10.4.8, which were working fine before the affected machines were updated, and continued to work nor were Windows machines affected. "As soon as I did that and rebooted, all wireless problems vanished and connectivity was stable and swift as before.

Enter your administrator name and password, then click OK.

Double-click the Setup icon of the CD-ROM folder to proceed to the following screen. Turn on the computer, then insert the Setup CD-ROM into the CD-ROM drive. MacFixIt reader Abrey Myers had success with this fix, and writes: Mac OS 9, Mac OS X Classic environments, or Mac OS X v.10.4.10 or earlier are not supported. In addition, delete any other files that have are named as such: Try deleting the following files from the ~/Library/Preferences/ directory (this is the Library directory within your User folder): Now some readers are reporting success with a fix not mentioned in our initial report. Most of these fixes were culled from our AirPort troubleshooting tutorial. Our Special Report offered a number of potential workarounds for these problems, including deletion and re-establishment of all preferred wireless networks, removal of third-party wireless monitoring utilities and more.

Specific to Mac OS X 10.4.8, users experienced inability to automatically reconnect to wireless networks when starting up or waking from sleep, poor throughput, or an inability to connect. This is relatively common occurrence with incremental Mac OS X updates, as most make at least minor modifications to both networking architecture and/or AirPort-related files. As part of our Mac OS X 10.4.8 Special Report, we noted that some users experience issues with wireless connectivity (generally with AirPort-equipped Macs) after applying the update.
