Well I did an About Avast and nothing out of the ordinary, but on going into Settings > Update, it reported virus definitions out of date. I just wondered if this might be the delivery, but still on 1.0.382.
Going to reboot to see if that does anything.
EDIT: 1st reboot went to 1.0.390 about to reboot again.
EDIT2: Nada, still on the slightly newer UI version 1.0.390.