I get an error when trying to access CP/Settings/Plugins:
Fatal error: Class 'Craft\PluginVariable' not found in folderpath/craft/app/variables/PluginsVariable.php on line 47
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Sounds like an FTP upload or an unzipping operation didn't finish properly.
Try downloading a fresh copy of Craft from http://buildwithcraft.com and replacing the old
craft/app folder with the new one.