Hello, I have the latest version, and indeed this started happening after the last program update, never seen it before.
Basically, avast! doesn't check for virus definitions updates even if correctly configured to do so. I can see this from the "Last attempt to update:" in the info section, which is always stuck at the same day/date/time. Manual updates work well, as expected.
But what could be the problem? There is something I can try in order to solve this issue?