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I would suggest you to first update Lightroom to the latest version 6.7, in case it does not help, try uninstalling and reinstalling Lightroom.
Also you need not worry about losing the images when uninstalling Lightroom.
Silly quesiotn, but how do I update Lr.
Can't figure it out since I get none of the usual headings at the top of the screen/page:
Hi again Tanuj,
Never mind: finally found the update trick.
Will get back to you if nothing improves.