http://www.avast.com/virus-update-history hasn’t been updated since May 15th. It’s currently showing 15.5.2012 - 120515-1 as the latest.
i guess that means they have work with higher priority 
It’s updated today. Looks like the guy got back from vacation. ;D
They are meant to be updated automatically not manually, but on occasion for whatever reason it doesn’t update automatically.
That’s what I’d read, also. Unfortunately, yesterday’s update and now it’s not updated today. When one clicks on the Avast Update popup to check the VPS version, the information is wrong as it’s pulled from the same source.