IE 11 on Windows 8.1 (not Pro), Won't save compatibility site list upon exit

I'm fighting a Windows 8.1 (non pro) PC that will NOT save compatibility mode sites when exiting. Every time we start IE 11, we must re-add the same site.  We're running Webroot SecureAnywhere, but we have other PC's that are exactly the same running Webroot that work just fine, so I've ruled out interference by the AV software.  It's never been infected by a virus, in fact, it used to save the sites just fine, but in the last 2 weeks, quit doing so.

Help!
kennygeorgeAsked:
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