One of my team members can't log in and I was attempting to use the log in as user button in site admin/user management. the button worked once. The second time it threw up an error message " an error occurred while trying to log in as X" and then the page appears to be allowing me to log with this pop up " you are now logged in as X" in but never alow the log in. (the progress circle just cycles) Then the page is frozen and the only way to get away from that page is to use the browser back button.
How can I help this person with re-setting the password?