I experienced a few instances where my the follow statement where my ASP application (using VS2005, CRXI-R2+SP4, Datasets and CR Viewer on the server) thows an error on my server (running Server 2003).
Dim Report As CrystalDecisions.CrystalReports.Engine.ReportDocument = _
Catch ex As Exception
JavaMessage("Report Not Found")
I don't know what the exception is at this point. But something happens and the crystal reports in all my websites break uniformly. I need to restart IIS to get things back working. This has happended to me 3x now.