I had this problem with Xcode after installing Lion
found article HERE
MAS Update Bug
1. Quit the Mac App Store
2. Trash the following folders and files; (~ is your Home folder)~/Library/Caches/com.apple.appstore
~/Library/Caches/com.apple.storeagent
~/Library/Cookies/com.apple.appstore.plist~/Library/Preferences/com.apple.appstore.plist
~/Library/Preferences/com.apple.storeagent.plist3. Restart your Mac
4. Open the Mac App Store
5. Log into your MAS account
I can't log in to app store on my macbok pro i7 - I dont even have the above files on my computer. Can't download lion ! Help ! thx
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