Just got an external Logitech K320 Wireless Keyboard (with unifying usb dongle) As most of us know, the ALT key and WINDOWS key behave in a swapped manner when it comes to mac keyboards. I want the ALT key to act as the COMMAND key and the WINDOWS key to act as the OPTIONS key. I go to system pref, keyboard, modifier keys, select the correct keyboard in the drop down (unifying device) then set as needed. After pressing ok, nothing works, it is still defaulted. I go back in, check that the settings are correctly changed, and they are. I also tried to test the internal keyboard while the unifying usb is plugged in. I make the changes to internal, press ok, then test. Nothing. The only way to make the modifier key changes to actually work, is to unplug the unifying usb dongle, make the changes (I am only able to select the internal keyboard) and save. Test, and the changes actually work. For some reason when I have the unifying usb dongle plugged in (directly in yes, not into a usb hub) it will show settings get saved, but the changes dont actually happen. This is insanely frustrating, I've searched all over, tried deleting plist files, nothing works. Any ideas?