This sounds like a php session problem (server cannot issue/save cookie properly). Check your server configuration settings related to php session http://php.net/manual/en/session.configuration.php.
Use this script to check if session works on your server: session_checker.zip
If you cannot fix your session config, try adding this line to filegator's index.php file
ini_set('session.save_path',realpath('.').'/config');
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