Hi all!
I just upgraded to Avast Premium, and faced the same issue. What I saw was, that with Avast installed, some programs lost connection to the internet. When I opened the application settings for the firewall, I tried to set the access policy to all connections for this app, but it was "automagically" reset it to internet out level. Other than that, the whole application rule page seemed to constantly refresh itself, rewriting the values to the initial for every application. For applications with no predefined rule, I tried to set the value to "ask", then it started asking me again and again, whether to allow this application internet connection, even though this definitely had a rule listed. I tried to reset the previous value to allow and to auto-decide, the pop up window kept appearing, even after I shut the firewall off. Restarting the machine, and reinstalling avast didn't help. I also installed the Beta version, that supposedly fixes this issue, but it still persists.
Hope it gets fixed soon, I have to uninstall avast until then.