@sw, haven't you updated avast from free version to IS version? I mean, two days ago avast started asking some users for free 15-days IS trail, is this your case? You can check it if you open avast UI and there should be "free"/"internet security" in the title (or there's subscription info in Maintenance tab). Thanks.
Why did you do this? Why did you started advertising?
Me, and as I know, lots of other users liked that avast! didn't advertise itself - but now, it usually advertises itself... it's annoying.
I tried IS because of the offer and the promise that we can switch back by pressing only one button.
To be honest, I didn't like the IS, so I switched back. Then, I lost my browser's internet access...
I had to uninstall avast! in safe mode and then reinstall it in normal mode.
Strange thing happened: avast! did remember some of the settings I changed (e.g.: ask mode in Behaviour S.). It's not a problem, but I don't understand it.