Lately, more than a few people have had trouble with missing file names in the thumbnail view of some of their folders. It isn't entirely apparent why this happens, but fortunately the cure is pretty simple. If you are one of the poor souls who happens to be missing their file names, follow these steps:
You should now see thumbnails with file names under them.
Apparently this was added to Windows as a feature to allow the thumbnails to be displayed a little larger, so you can use this technique to toggle the file names on or off in thumbnail view.
Links:
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