NIS Freezes When Trying to Set Program Rules in Smart Firewall

I am running NIS v21.6.0.32 on Windows 8.1. When I go to Settings, then to Smart Firewall, and click on the Configure [+] for Program Rules, NIS freezes, and I have to shut down and restart the computer to fix it. I have run Live Update and it indicates I am up to date. I found a post for a similar issue, but it was a much older version, about a year ago or more. The solution posted there was to download an update that was a full reinstall, but that isn't the case here.

Any recommendations will be appreciated!

Marty