This is a still a problem with Windows 8.1.
We are now using free version .2225 , early versions also blocked traffic (2 weeks or so). But only on my children's (3) PCs are blocked ( they are running windows Family Safety ). My computer, not running the Family Safety, has worked well throughout these last few avast program updates.
If I turn off the Https scanning , as suggested in the post regarding xp issues, their PCs can once again connect to the sites (namely youtube.com).
Thanks for any updates in this regard. I hope this post isn't buried in this thread.