I just installed Avast on my fresh Windows 8 installation and the connection to my account could not be made.
Attached you will see what i get after entering my mail address and hitting on the green button.
Connected to the internet?
Glitches can happen, Have you rebooted?
Also you could try a Repair of Avast and see if that helps. 
Hi chrisonline!
I have this, too. Since a week or more. We’re not getting more. I just tried.
HDW38
OK thanks, i have just created a support ticket.
Can you add a ticket too?
I tried this yesterday, but no change.
HDW38