No message ?

Consumer Products Public Beta Avast Antivirus Beta
1

https://forum.avast.com/index.php?topic=193000.0

That site is blocked and shows the pop-up in the regular version of avast.
I have W10 and the latest beta running in a VM (Oracle) and the site is blocked, but there is no pop-up.

Looks like a bug.

2

http://screencast-o-matic.com/screenshots/u/Lh/1479043896838-32783.png

3

Just tested it, it works here.