Thanks Fiddler,
Just checked all my BD player settings again-changed dynamic range control from auto to wide-have previously had it at off-no difference I'm afraid.
I have strong audio from my centre and the front mains are also clearly working.
Ok, if Center is working, that's a good sign. If Center works usually LFE works. LFE is not always active.
If it's displaying MOV6 PCM and Center works then that's good. Your 75% there I think and I believe it's still an issue between HD621 and 568.
I forget on 568, you have to make sure you have all channels mapped to that multichannel input. It's fairly flexibly on G68/861, not sure what could be set wrong on 568 side.