Options software must handle print screen correctly. I can't use the keyboard shortcut L-Alt + L Shift + Print scrn to toggle Hight Contrast at all now. Even when trying to use another keyboard with s dedicated print screen key to set up the keyboard shortcut the Options software both Options + and Options fail. I can't assign any keys now, not the MX Keys S nor the MX Master 3. It seems the software recognises the print screen from another keyboard but not the Left modifier. I've used a second keyboard to assign print screen to the snip key wich works but even then the MX Keys S keyboard will not launch High Contrast using the keyboard shortcut never mind assigning a keyboard shortcut to a key.

Very disappointed in this having purchased this keyboard only to lose needed functionality and costing me more for this loss of functionality.