But, rather than exploiting that perfect tool, you appear to want to debug by crowd-sourced guessing….

Ummm - no - not doing that. Asking directly whether anyone had any experience of a similar issue. That's all. :-) Already several folks have made some helpful suggestions which I'm looking at. I've already narrowed it down to this being the apparent issue. I could still be wrong of course, not saying I'm not, and, I'm not in any way abandoning either further instrumentation or further debugging. Not at all. So, I continue to appreciate and be thankful for all helpful suggestions. Sometimes the off-the-cuff comment can be the item that stimulates the *actual* answer - even when it's not relevant directly. All good. :-P

Kind regards

Derek

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