AIS Firewall problem.
Each of the past 3 Windows 10 Preview Upgrades have resulted in the Avast Firewall not working.
http://www.screencast-o-matic.com/screenshots/u/Lh/1435947898066-39173.png
Each new Upgrade has resulted in needing a repair of Avast:
http://www.screencast-o-matic.com/screenshots/u/Lh/1435948047223-22209.png
After the repair and a reboot, the Avast Firewall again works:
http://www.screencast-o-matic.com/screenshots/u/Lh/1435948134725-63473.png
This obviously needs to be addressed. July 29 is not far away. 