I keep running across comments that Avast and ZoneAlarm don't play well together. And perhaps that's responsible for the difficulties I experienced when trying the 2011 and 2013 updates. (Prior to the 2011 version, I never had a problem running Avast with ZoneAlarm.)
I apologize if I missed it; but if there's truly an incompatibility between the two programs, shouldn't that be prominently mentioned on Avast's website? For that matter, I don't even see a "Requirements" section, which is commonly found with other company's programs.
As much as I like Avast, or at least used to like it, I'm not about to remove a program that's served me well for over a decade just to accommodate a "new and improved" version of someone else's program.