Delete the wp-admin and wp-includes folders on your server. Download a fresh copy of wp and upload those folders to the server. DO NOT delete wp-content.
So I just tried this and it didn’t work. Any more suggestions?
Have you tried:
– deactivating all plugins to see if this resolves the problem. If this works, re-activate the plugins one by one until you find the problematic plugin(s).
– switching to the Twenty Ten theme to rule out any theme-specific problems.
– resetting the plugins folder by FTP or PhpMyAdmin. Sometimes, an apparently inactive plugin can still cause problems.