KBA: Blank space appears in the file when you export a report to a physical page format file in SQL Server 2005 Reporting Services or in SQL Server 2000 Reporting Services
Source: Knowledge Base
Product: Microsoft SQL Server 2005 Reporting Services
Notification Contents: New, All Modifications and Delete
Blank space appears in the file when you export a report to a physical page format file in SQL Server 2005 Reporting Services or in SQL Server 2000 Reporting Services
http://support.microsoft.com/kb/938943/en-US