The same thing with the ASB happened to me. I uninstalled the Beta version, reinstalled the stable version, and the problem was solved.
By the way, I have a great expectation with the new 19.1 release. I will be very glad if the GUI is refined and improved, to give Avast a much better "look" than the current version. This GUI has been kind of hard to endure!
Happy New Year (with a new Avast release) to all!