In my setup, it seems that following key bindings are not displayed in the tooltips: CTRL+ALT+key NumPad keys And some other keys. Funny thing is, that I can assign ALT+F3 to a icon and it is displayed. If I assign ALT+F2 to the same icon, it isn't. However, if I assign ALT+F2 to a different icon, the hotkey is displayed in the tooltip. Very weird. Maybe it is the same bug as some fields in a grid view backpack suddenly becoming unusable.