Same, for the past year it never returned the correct posts. So I just use Google, for example to search for "locked account"
----------------------------------------
site:forums.aspdotnetstorefront.com locked account
----------------------------------------
That searches only the aspdotnetstorefront forums for the words "locked account" and for the most part works great. To change it, keep the first section but change the words "locked account" to whatever you want.
Atleast for now until someone can shed light, it's a solid work around.
SQL 2008, Visual Studio 2010
Source: C#
Version: AspDotNetStorefront ML 8.0.1.1/8.0.1.1
Framework: .Net 4.0 (Running)