My PS4 doesn't seem to respond to most of the keystrokes documented here while playing a Blu-ray (at least F1 and F3 don't work) either from the FLIRC or a standard keyboard. Is there something I'm missing? I've found that I can sometimes get those keys to work if I hit PrintScreen and get an error. When I go back to the disc, the menus will have graphical corruption, but F1 will work.