If you see the "ParkMe has been superseded " message when pressing the GSX hotkey, it means you must have messed up your key assignment (the installer won't change them) so, the key previously used for ParkMe is assigned to the GSX key, and since no two add-ons can share the same key, one of them is not working.
By default, ParkMe is Ctrl+Shift+P, YouControl/GSX is CTRL+F12 and GSX direct is CTRL+Shift+F12. Check the key assignment menu under the Couatl menu and be sure they are set like this, with no conflicts.