I can still update avast! (thank goodness) It's just after clicking on "On" it turns off Automatic update.
Perhaps it is acting like a toggle switch. If the updates are already set to automatic it is switching them to manual, give it a try and see if it acting like a toggle without having to edit the avast4.ini.
I did that first, but it wasn't acting as a toggle, it was just one click and stay. I had to access the avast4.ini. to change it to automatic. But it's okay now cause I change the database from XML to ODBC and it fix it.
Heres an update: After I change it to ODBC, now I can't change it to Manuel Update, I don't really mind Manuel Update, I rather choose Automatic, but now avast! won't turn off automatic updates until I change the database back to XML. You think it's a bug from the beta?