It is looking to me like W10 is incompatible with Avast. Is there a fix in the works?
Update: Looks like the Avast Firewall specifically…
Did you use the “Search” function?
There are a pile of Topics about this ???
Repair Avast:
- Control Panel → Add/Remove programs → Avast
- Click on ‘Repair’.
- Follow instructions.
- Reboot.
Generally a reboot or two will cure this before you need to repair
A repair is preferred, as it also updates him to the latest Avast version (if needed).
Yes, worked here.
Found with Search. 
https://forum.avast.com/index.php?topic=174362.0
I appreciate the input.
You’re welcome.