Hi *,
just wanted to say that we’ve just officially released a new update of avast Home/Professional (labelled as 4.6.623) so feel free to update to it (especially if you’re having problems with the previous build, 4.6.603).
For a list of changes, please see e.g. http://www.avast.com/eng/av4_revision_history.html
Thanks 
Vlk