This problem still exists in Avast 2014.9.0.2010.
I tested it at EICAR site http://www.eicar.org/download/eicar_com.zip .


Intel Core i7-3770/ 8GB RAM/ Windows 7 Pro SP1 x64 (Japanese)/ avast! free 2014.9.0.2010/ Privacyware Privatefirewall 7.0.30.2/ Firefox 26.0, NoScript, RequestPolicy