First - Its an amazing app and love it. This is a new error with a specific user/pass/server connection, which baffles me. HeidiSQL version: 9.4.0.5125 Error message when trying to authenticate to MySQL Server (relatively new stable version): Plugin '*3AEDEEAC1CA4D924B94F089030517A18A3F910AA' is not loaded My root acct works, as well as others that I've made. So... not sure what is causing this error to pop up. The more I've messed with it, the more I think that it could be related to one of the more recent updates Ive done, or to copying another session.