Guys,
Coming back to the 421 for a moment rather than the seemingly forthcoming 422

does anyone else have a problem with the 421 not relaying some of the control signals through to the display.
I have a media centre which when rebooted (as it often needs) must be connected to the display otherwise it 'helpfully' turns off the display output on reboot. Even if the display is switched off the media centre 'sees' the display bit only when directly connected. If connected through the 421 it doesn't 'see' the display. (Before anyone askes yes I did check the correct input was selected on the 421 prior to reboot).