Webshield not blocking sites.
Before it was working good, but after updating got problem.
No firewalls is installed, and windows firewall is disabled.
AVAST Pro (demo)
masks that was used:
*.some.site
some.site
some
http://www.some.site/
no one was working 
ignore local connections was unchecked
Strange… it works here.
Do you really have the URL blocking enabled (probably yes) and Web Shield running?
I test on other my computer and it also was working, hmmm
I now upgraded to home release and tested again. And it works.
I will test more with professional.
If I will find why it was not working I will tell…
I know that it is not big differsns but who knows…
BTW… what functions stops working when Demo version reach limit time?
The Professional features: Enhanced Interface, Tasks, Script Blocker…
All the differences between Home and Pro version.