same problem here except the yellow exclamation!if i start the HID input service manualy only the volume buttons work!if i stop it all the other special keys(my doc,my pic,...,messenger) work including mute!sleep button always works!it al started after installing both of " Microsoft - Other Hardware - HID Non-User Input Data Filter " updates
i think the problems will be solved if i uninstall
them but i can't find the KB numbers!any help will be appreciated