Finally got the DSW firmware updated and ran the film that started it all. Very happy to say it was fine. It seems the problem is sorted at last.

Can I just say thank you to everyone who responded to the original post and messaged M.
I am very grateful for your help in getting this issue rectified.
An extra thank you to Quantum Bob for your help. And to the Dealers that helped.

Nick


861v8+ID41, HD621, DSP6000, DSP5500HC, DSP6000, 2x DSW's, Roon, AudioQuest Niagara 5000, IsoTek Titan, Nova, Vision, Mira.