I have also noticed since a few updates ago that it doesn't work properly anymore. It seems as though the bind for middle mouse button doesn't work at all, like when I set the bind it just unsets itself again?
If I try and set the bind to a different key, for example "N" when I press N the GUI appears but then when I press N again it doesn't disappear. If I press F1 to bring up the console, or ESC to bring up the server info window and then press F1 or ESC again it disappears but then whenever I try and use -anything else- like press T to type something, or B for my backpack (another bound key) then it appears again and won't go away until I press ESC or F1 again.
I've just stopped using this plugin for now as it seems to be massively bugged out.