I had been using Avast Security Antivirus for many years. It has been my most preferred Antivirus to be precise. Recently, I had updated to macOS Big Sur and I am having a problem cause of this AV.
The following Core Shields are not working.
File Shield: This is the only working feature.
Web Shield: It’s disabled and is not allowing to tun on.
Email Shield: Same as web shield.
Real Site: It allows me to turn on. After turning on, again it automatically slides to the off.
The biggest problem is whenever I open Avast Security and click on the buttons it freezes. It takes up to 4-5 minutes for the screen to appear, and when clicked, it retakes the time.
Update: This issue has been fixed as of now! Confirmed at Mon 1 Feb 2021