It is still there with new VPS 0606-1. February 06.
The best answer I can get is from myself. :'(
Thanks for reading. Perhaps this is Avast Eicar-version for web-shield?
HL
EDIT February 07: I can see that a lot of people have read this post.
On my computer the alert has been there for nearly 2 weeks, I believe.
I am surprised that nobody comments on the post. Are you getting the (false) positive? Is there anything wrong with my Webshield?
I am DISAPPOINTED that this matter has not been taken care of by now.
If Avast can't handle viruswarnings on its own forum, what then?