It certainly does look like it, but I just can't work out why it only happens in Lightroom CC, hence the difficulty in dealing with Dell who say it is (must be) a software issue, especially since all their diagnostic/stress tests pass. Then Adobe say that the Intel HD Graphics 620 is "not supported", although as it passes the OpenGL test it clearly is, and basically wash their hands of it. All graphics cards are supported, just not for GPU acceleration for which you would need a really good card to make use of. I will update with the outcome, I see un-ended threads everywhere on the internet, as soon as a problem is resolved people don't bother finishing them off for others to learn by.
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