I've got avast! set to update automatically when new versions are available but it's been days since a new version became available (9.0.2007) and it's still at 9.0.2006. My PC, my parents PC, my friends PC... They're all stuck at the older version despite configured to auto-update.
I tried restarting the PCs but that didn't solve the issue...
If I go to the settings -> update, ironically it says a newer version is available (if I hit update it starts downloading it from 0% so it's not like it was waiting a confirmation or something).
This is in a clean 9.0.2006 install and also in installs that I manually updated from 8 to 9.
I actually don't recall when it was the last time I hadn't to manually update because the auto-update mechanism doesn't works, I think it's been like that in version 8 and probably 7 too.
I don't use any proxy, and my friends for example use completely different connections so that's not the issue, avast! is free to do whatever it wants but it simply doesn't...