Auditor is not tracking User Login even though an audit has been set up on the User Activity table.
Auditor will not track User logins using a Table Audit. In order to use a Table audit, GP must be running so that Auditor may track. The only logins it would track are those done through a soft login. Meaning, if you are already logged into GP and you click on the User ID, GP opens the login window where you would log in as a different User.
To track hard logins, meaning logins that are from launching a new session of GP, you will need to set up an Audit Group with a SQL Table audit for the User Activity table. Note that SQL table audits will not show the Company the User is logging into on the SmartList window.
Note: For more information on creating a SQL Table Audit to track User Activity see KB article: Setting up a SQL Table Audit to Track User Activity