Loss of keyboard when using a specific Microsoft account

My boss' son is having an issue that has me stumped.  Regardless of the computer (I've tried 3 different ones), when he logs and to a Windows 8/8.1 computer using his Microsoft account, he no longer has of the keyboard - either the physical one or the virtual one on the screen.  When pressing any keys, he gets a "clicking" sound from the computer.

Create a different Microsoft account for him and the issue disappears.

Has anyone heard of this?  If so, is there a fix?
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Those MS accounts sync their settings. So it could be that something had been setup (and worked correctly) on another machine but for some reason has this effect on those 3 machines now.
So resetting that account's profile might do it. Or better, just use the new account and transfer files over from the old one, it will save you from more investigation, I think.

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fcumminsAuthor Commented:
Thanks, McKnife.  Trying to figure out how to reset the account now - not sure he'll have access to his OneDrive docs if I have him use the new account.
Alan HendersonRetired marine engineerCommented:
It would be worthwhile to check that the default keyboard selection is correct:
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Windows 8

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