Can't update my apps

Hi,
I can't update my apps.
In the Updates tab, it always shows that all my apps are up to date...
http://i.imgur.com/4xz07.jpg
But in the Purchased tab, that is not the case...
http://i.imgur.com/g90ln.jpg
Plus, I know there are updates available because I have received emails from the developers telling me so.
Clicking "update" on any given app in the Purchased tab induces an alert saying that I need to sign in to the account the apps were purchased in but offers no way to sign in. I already am signed into that account (that's how I can see apps in the purchased tab).
I have tried signing out and back in, throwing out the macappstore preferences and signing back in, throwing away the whole app and preferences and recovering the app from a very old Time Machine Backup and signing back in. Nothing changes the situation.
Has anyone else experienced this? Does anyone have any ideas?
Thanks!

This appears to be a common error with MacBooks Air. If you Google search on the wording of the error code you will find posts in forums all over the Internet, and everyone that I have seen is a MacBook Air. And they also seem to have in common that a number of them had been recently worked on by Apple Geniuses at Apple Stores.
The most useful info in resolving the issue is that the image Apple Geniuses are using to format MBA HDDs has a bad .plist file.
To resolve the issue for most folks;
1. Go to Sys Prefs/Network and note your Network configuration. Then remove all network adapters.
2. Trash the file /Library/Preferences/SystemConfiguration/NetworkInterfaces.plist
3. Restart
4. Go to SYs Prefs/Network and restore the network adapters and configure your Network settings again.
The Mac App Store should now work properly.

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