Whats happened to the HDMI audio override? It's always worked fine for me to output audio via the optical out. Today went to watch BBCHD and no sound. Checked the override set to on - which it was. Reset the box and no change. Then set the override to 'off' and sure enough the output works again - although I don't know if 5.1 dd signal is working yet. Has this happened to anyone else, or has my box got screwed, or am I going mad?!