Thanks again Allan. I am thinking of removing Avast, so appreciate your input. I know there is a lot of debate about the need and usefulness of anti-virus software for Mac's. And I know that Avast's business model is based on giving away the software for free, then using the software to collect user data behind-the-scenes for marketing purposes. So I am not surprised about their move into adware. Maybe I will try ClamXav and see how that works.
FYI that I have had no issues with 1Password with OS X Mavericks. I have been a 1Password user for a couple years now, am running the current version of the software, and it works great! Also like LastPass and KeePass, but found 1Password to have a much nicer interface. I have a Apple-only environment, so others might have a different experience in a Windows or Android environment.
Thanks again.