Stored Proc

I am  working on a vb.net app w/SQL Server 2K backend.  App uses microsoft's Ent. library Data Access Application block for data access.  The app is working fine.  I have stored procedures that will not return the desired results.  Below is a sample proc.

SET QUOTED_IDENTIFIER ON
GO
SET ANSI_NULLS ON
GO
SET NOCOUNT ON
Go

IF EXISTS (SELECT * FROM sysobjects WHERE type = 'P' AND name = 'RaidSiteCaseCount')
 BEGIN
  DROP  Procedure  RaidSiteCaseCount
 END

GO

------------------------------------------------------------------------------------------------------------------------
-- Date Created: Friday, November 11, 2005
-- Created By:   Clifton Robertson
------------------------------------------------------------------------------------------------------------------------

Create Procedure RaidSiteCaseCount
(
@SecurityToken as uniqueidentifier,
@CaseCount as int out
)
as

Begin

SELECT @CaseCount = Count(DISTINCT ac.casenumber)
FROM dbo.[Inventory] i
Inner Join dbo.[AgencyCase] ac On i.ProjectID = ac.ProjectID and i.caseid = ac.caseid
WHERE i.ProjectID IN(SELECT ProjectID FROM fnProjectsValid())
 
End

GO
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS ON
go

This proc always returns 0 to the calling application.  If I run the select in analyzer it works fine.  Also if I change the select of the procedure to just do select count(*) from [table], it works and returns the correct count to the calling application.  I even placed a Select @CaseCount right before the END keyword, that did not work.  I also tried SET instead of select, you know,  SET @CaseCount = (Select Count(DISTINCT ac.casenumber)………….., this did not work either.  What is going on with this   Can anyone help < xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />