Avast! 6.. loss of internet..

So with Avast! 6 I have this issue with losing my internet connection while “Web shields” is turn on. If I turn it off, my internet works fine. So what is the issue here?

http://forum.avast.com/index.php?topic=76808.0

More info…
Windows version
Firewall
Old antivirus installed
Other security programs that could interfere