Lots of people who visit the 'support' forums you mean, which is par for a support forum. If this were a 'bug' it would be impacting 'every' avast user, that is the nature of a 'bug.'
That clearly isn't the case (though it is a pain for those it is affecting) or there would be a flood of the 130 million plus avast users hitting the forums. But for those that are experiencing a problem. It needs to be worked through to try and identify the cause as there are so many different permutation of what is on an individual users system, firewall, other security applications, previous AV (if remnants remain) and any number of other things that may well conflict with the web shield. So this isn't something that is easily found.
By far the greatest majority of avast5 users are suffering none of these issues, but they don't come to the forums to shout about the fact that they don't have any problem.