I have virus definitions set to auto update.
The application is set to notify. It is my understanding that the notification has not worked in quite a while. I understand this and check manually from time to time.
My heartburn is the update that occurred at the end of February. I was doing Microsoft patching and I would never update Avast engine until I had completed the Microsoft patching. I avoid updating both at the same time to help with troubleshooting if a patch screws something up. With the way things are going at Microsoft, odds are they will be at fault.