Hi all,
Been having this 'issue' for a little while now, iirc it's only been a thing since upgrading to Avast One, I don't recall having this with the previous free version. Whenever Avast blocks a site (marked by an aborted connection for web/note in the log file) there is no popup, not sure about file shield but this is just going off the web shield test site/other malicious ones I may have visited in the past on the log file alone.
Silent mode is not active, so popups should still appear, honestly can't say what could be stopping them showing if it is anything, I also run MBAM pro with some exclusions so perhaps that could have a part to play. If this is a little vauge, I'd be open to putting here more information on the matter. Win 10 pro, 64-bit.
I tried this on Edge but also Avast Secure Browser (which security/convenience wise is actually pretty solid), on