Like your plugin!
I have deployed the User Access Manager (UAM) plugin. Because of this, your "Recent Activity" column in the user list only shows the header while the column is empty. If I deactivate UAM, your data shows up.
Any suggestions for solution?
By the way, you display your activit timing as "xxxx minutes ago", would it be difficult to just show the date/time of the activity (e.g. when exactly the login occured)?