Cannot surf the web since update on 10 November

After updating my definitions on 10 November about Midday GMT I could no longer surf the web with the web shield in place. The Internet was working fine I was getting email Skype was working.
When I turned off the web shield all worked fine. I thought it might have sorted itself out after the last update but the problem is still there.
Does anyone have any ideas?

Thanks Vitivillain

Follow the directions of this post. It worked for me.

http://forum.avast.com/index.php?topic=65054.msg549162#msg549162