Alright, I've prepared an (yet-unofficial) update thath should solve the problems. I'd like to ask anyone who's been having problems w/ version 4.1.412 to try it out.
How to install it:
1. Download the file
http://cat.asw.cz/beta-bart2/servers.def and place it to the <avast>\setup folder (overwrite the existing file) -- see comments below on how to download the file.
2. Invoke avast! program update (will require reboot).
That's about it.
Note that servers.def is a text file - so I recommend to right click the link and select "Save as". If you left click it, it may open in your browser as text (as a page). In that case, you can simply copy&paste it to the corresponding file, but the first method is definitely more convenient.
(Yes you figured it -- the procedure is exactly the same as was for the beta last week).
And please -- let me know how it goes.
Thanks
Vlk