system
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I was using Private Firewall and avast free until the new beta (v2014 beta) was released.
PFW didn't play well with the new beta. Uninstalled PFW then installed Comodo Firewall v5.12. So far so good.
Interesting. I don't install security apps that are in beta. But if the final version conflicts with Privatefirewall I'll switch back to AVG.