I suspect it might be more to do with your OS being win7 64bit, though I don’t know that for sure as an avast user not avast developer.

My other system, netbook with win7 starter (32bit) which I have just started shows 10 scripts have been scanned. Over the last week in line with my last image Statistics, it shows 1,308 scripts scanned.

So I honestly don’t know why yours isn’t showing any activity. But I believe there are other win7 x64 users that are showing activity, hopefully one of those can confirm.