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Thanks for the ideas. The problem happened even with the on-screen keyboard, so it was not hardware.
I discovered that the problem was user profile-specific. I was getting ready to back up the profile, create a new one, and then restore the files, and then realized I hadn't yet tried a System Restore. I ran a System Restore to a point in time a few days ago, and the problem is gone. So I don't know what happened, but a System Restore did the trick for me.
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