in "libraries\plugins\AuthenticationPlugin.php", line 96:
               session_unset();
               session_destroy();
I think it's better that you manually unset the parameters that needs to
be deleted, instead deleting the whole session. I am having much
problems, because PMA destroys all my other sessions too.
(btw, it is nicely done like in:Â "libraries\sessions.inc.php" , line
26, where it checks if session exists, it just closes);