Sounds like the test did not reveal anything new.
It removed the network from the equation (perhaps more complicated than most and yes

unnecessarily so)
So after the test, there is definately an intermittent issue with Ensemble and/or ID41. Pretty conclusive if you ask me.
Yes and I'm sure it is the ID41 (took a while but I got there)
It keeps disappearing from the Control:PC software causing the software to stop playing tracks intermittently while it relists the available outputs. This is why initially I though it was the old Ensemble playing up as this started when using the Control:PC software on my main computer.
And perhaps I did use this as an excuse to get a new QNAP to use as a possible core to replace the Ensemble.
So I'll have to contact Meridian to see what the possible solutions are unless But I'm going to see if I can convince my local dealer to 'lend me' a MS200 to confirm for certain.
Thanks