[JohnnyL]

Hi Hias, thanks for your reply. 

I just went back to #0407 - all OK
update to #0408 - all OK
update to #0409 - all OK
update to #0410 - not OK, CLAC LEDs both on, system/audio device = PI:HDMI

dmesg:
http://ix.io/1G0u

config.txt
http://ix.io/1G0D

So build #0410 seems to be when this starts. (Unlike what I wrote in my earlier post - blame my failing memory)

Anything else you want me to do while it's in this state?

Cheers, John