I have a Design time VS 2005 web page which has a CrystalReportsViewer control which references a CrystalReportSource control which has a FileName property that points to an external file which is a Crystal .rpt file of a report created by CR v10 Dev Edition. I am running on Vista SP1. When I first created this page 3 months ago on this same computer, during design time, an image of the report in the referenced external .rpt file showed up inside the CrystalReportsView control. Recently, the above image disappeard, and there was a Red message in its place the said "Error: Object reference not set to an instance of the object". This same report generates correctly during the runtime execution of this page. The Design time CrystalReportsViewer still works correctly when I look at the same page project on another PC. I know there must be some setting in the environment of the Vista machine that was changed. Please help.