Thanks everyone for responding.
Mine is set to Medium, so I changed it to Low. So why were the "Block it" and "Permitted URL's" buttons are grayed out and how do it ungray them.
BTW, man is that setting hidden. "avast! On Access Sanner", Details, Internet Mail, Customize, Heuristics. Just by eliminating the "Details" option and having it be the default would make this 10 times easier to find.