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Thank you Wilco. SEQUATOR produced a stacked image see attached.
My humblest to everyone, particularly Alex, for not sending the screenshot of DSS message which might have made my problem plain. Apparently no one else has ever got this message from DSS. (incidentally this is with threshold 50% but any other threshold gives the same answer).
I am sorry, Martin to have put you to the trouble of writing out your whole DSS procedure, however I think it is worthy of putting in the IIS handy hints for beginners.
There is more to say about my experience with all this and what I have learnt, but best perhaps saved for another day and a fresh thread.
Avagoodweekend (we have thunderstorms and rain here)
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