Won't automatically connect to Airport network after 10.4.8 update

After updating my Mac Mini CoreDuo from 10.4.7 to 10.4.8, it will no longer automatically connect to our Airport Express based Wi-Fi network. Even though the Network settings in System Preferences have not changed, and they do list it as the preferred network, it still will not automatically connect after log in.
Does anyone have this issue, and know of a solution?
(aside from the workaround of manually connecting after log in, and after waking the computer from sleep).
Background: My setup is to join preferred networks by default, the network name continues to be the one listed, the network still continues to show up in the Airport network list in the upper right corner of the screen. In essence, the Mac sees it is there but just won't connect to it. We have two other Macs in the household, both are PowerPC based, and both were updated to 10.4.8, and they have no issues. They continue to automatically connect to the Wi-Fi network we have. This seems to be with our Intel Mac only.
Mac Mini CoreDuo   Mac OS X (10.4.7)   Mac OS X 10.4.8

This all happens most likely due to a corrupted key chain (entry).
For instance, if you choose to keep your local Airport password stored in your personal key chain it needs to be accessible by the private Apple Airport Framework used by the network preferences. If this by any means, is not possible - the automatic login into you Airport WiFi network cannot take place.
All you have to do to get this fixed is:
1) Launch your Keychain Access Application located at: /Applications/Utilities
2) Open the Keychain First Aid (under the Main Menu: Keychain Access)
3) Set the Radio Button to Repair and enter your Keychain Password (most likely your personal password)
4) Start.....
Now after your personal keychain (name=username) is repaired it might be listed double in your Keychain List Window (it depends how you've setup the keychain). If so, NEVER DELETE ONE OF THIS ENTRIES because that's obviously a cosmetic bug in the Keychain Access Application but not harmful. Just look in your local Preferences Folder, locate the file "com.apple.keychainaccess.plist" and thrash it. Re-launch the Keychain Access Application and there is only one again.
Restart your Mac and........
After all I think anything should be back up to how it supposed to be. :-))

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