FIX: A SQL Server Agent job fails when you run the SQL Server Agent job in the context of a proxy account in SQL Server 2005
The following pages were recently modified.
Source: Knowledge Base
Product: Microsoft SQL Server 2005 Enterprise Edition & SQL Server 2005 Standard Edition
Notification Contents: New and Major Modifications
FIX: A SQL Server Agent job fails when you run the SQL Server Agent job in the context of a proxy account in SQL Server 2005
http://support.microsoft.com/kb/938086/en-US