But that's my problem Pete.
I buy my certs via Namecheap who sources them from Sectigo. The problem seems to have arisen because the companies in the chain changed their names. Sectigo I think changed last year (but I still had to replace that cert) and this year User Trust made some incompatible changes as well. So although the root-root certs are indeed in the set provided by IBM the two intermediate certs both had to be updated. They were both in the bundle so it wasn't an arduous process once I remembered that I had to manually copy/paste them into separate files and import them. It would just be nice if the DCM automagically did this - or at least processed bundles.
It looks like Jessie's tools (https://github.com/ThePrez/DCM-tools <https://github.com/ThePrez/DCM-tools>) do handle bundles so I'll probably go that way next time.
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