I clicked on the buy Internet Security button, at a special price, in Avast Free 2015 - Store.
Then an Avast Store window opens, asking if I want to buy 1 year or 2 year protection.
After I click 1 year, the window turns white, I can just read "Avast Store" and "loading" forever, as if something is blocking it.
On the other hand, if I open Avast Store in my Chrome browser, it shows fine, but I don't get the special price there.