Object Reference not set to instance of Object when sub-report on new page

I have a problem when my sub-report goes onto the second page of the report, with an error message.
My VB.NET displays a report and sub-report (in the footer) in a CrystalReportViewer:
- When both are on the first page, both display fine
- When the sub-report (or at least part) goes to the second page, the report displays OK, but without the subreport. When I go to page 2 of the report - hoping to see the sub-report - an error message is displayed, with title "Crystal Report Windows Forms Viewer" and text "Object Reference not set to an instance of an object".
This problem occurs both on my development machine in VS and at a user site.
Am desperate for some ideas please! I have VB.NET in Visual Studio 2010, and SAP Crystal Reports, version for Visual Studio 2010. The program is targeted for .NET Framework 3.5.
I looked for the HandleException event on my Windows Forms Viewer, as suggested by SAP and Microsoft, but cannot find this. See for [example|http://devlibrary.businessobjects.com/businessobjectsxi/en/en/crystalreports_dotnet_sdk/crystalreports_net_doc/doc/crsdk_net_doc/html/crlrfwindowsformscrystalreportviewerclasshandleexceptioneventtopic.htm]

Usually, the error is due to the object going out of scope. Placing the object in a session may help. Moving the CR code to page init or page load may help. Looking at samples may help:
http://wiki.sdn.sap.com/wiki/x/JQBmBQ
CR Dev help files are here:
SAP Crystal Reports .NET API Guide     http://help.sap.com/businessobject/product_guides/sapCRVS2010/en/crnet_api_2010_en.zip
SAP Crystal Reports .NET SDK Developer Guide     http://help.sap.com/businessobject/product_guides/sapCRVS2010/en/crnet_dg_2010_en.zip
Finally, ensure you are using Service Pack 2 (see the sticky thread at the top of this forum).
Ludek
Follow us on Twitter http://twitter.com/SAPCRNetSup
Got Enhancement ideas? Try the [SAP Idea Place|https://ideas.sap.com/community/products_and_solutions/crystalreports]

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