Strangely I noticed the problem too: Avast Free Antivirus got changed into AIS with expired subscription without my permission. After its own update all it did is downgraded from avast 8 to avast 7(wtf). Downloading Avast Free Antivirus and i’ll see if it fixed the issue.

EDIT: Installing… Crossing the fingers!

Edit2: i had to reboot twice on avast re-installation, but afterwards it worked like a charm.