FIX: An SSIS package stops responding when you run the package and the package contains a data flow task that contains one or more MergeJoin transformations in SQL Server 2005
Source: Knowledge Base
Product: Microsoft SQL Server 2005 Enterprise Edition, SQL Server 2005 Standard Edition & SQL Server 2005 Enterprise X64 Edition
Notification Contents: New and All Modifications
FIX: An SSIS package stops responding when you run the package and the package contains a data flow task that contains one or more MergeJoin transformations in SQL Server 2005
http://support.microsoft.com/kb/938049/en-US