Sorry, I should have said F/W 3.17.3, not 2.17.3.
I tried to reproduce the problem again by highlighting various words in the last half dozen lines on a page, and got the problem once in about eight attempts. As I said, it's intermittent. Doesn't seem to be related to a particular line on the page - as you can see from the images, this word is on a different line from the word in the previous image, and the highlighting is completely obscured by the popup definition.
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