Mac App Store says "Unknown error."

The Mac App store is giving me an "unknown error" when I try to install a purchased app or but another app.
I *think* this is a result of me running a chmod or chown recursively on the wrong directory. I've run the "Restore Disk Permissions" on my main partition and although that said it fixed some things, it didn't solve my App store problem.
What user, group, and permissions do I need to set and on what files and directories do I need to set them in order for this to work?
As a side-note, I'm logged into the app store with my only account. Choosing "Sign Out" from the "Store" menu does nothing. I upgraded to OS X 10.7.4 and rebooted today. I've deleted the App Store cache files and rebooted.
Thanks,
Joel

Hi Joel ...
How about third party software. If you have anti virus software installed, disable that.
Little Snitch can cause the issues you are experiencing also.
And try deleting the App Store cookies .plist
Go to ~/Libary/Cookies
Move the com.apple.appstore.plist file from the Cookies folder to the Trash.
Try the App Store.
edited by: cs

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Mac App Store says "Unknown error."

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