Crystal Reports Viewer Locks up when called from VS.net

[PatMcLaughlin]

I have used Crystal Reports with Visual Studio and Foxpro for several years without a problem. All at once, I have one program that will no longer display the form in the viewer. The form uses an XML document for data and creates a graph and reports on other data. It will print the form from vb.net, it will create a pdf from the vb.net, but when you call for a preview, it will show the beginning view of the Crystal Viewer, the wait cursor on the viewer will spin once and stop. It doesn't make any difference if there is a lot of data or little data sent via the xml. There is no error message. It just stops. If you open the report in Crystal Reports itself, it will preview without a problem. I currently have in excess of 60 reports that are created on the same Visual Studio or Crystal Reports (2008) (some written before/Some after) that use the same basic code and work without fail.

Where do I look for an error and for What?