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> Just out of curosity, I want to know what was the source of problem. > I have been using IDV for quite sometime. I made a change to the ImagePlanViewControl to support displaying satellite imagery as "topography" - effectively mapping the brightness value to the Z dimension. I am not sure why the change causes that error, but since this was experimental, I have backed out of the change. It seems that the doTransform method of ShadowImageByRefFunctionType is being called even after the image is removed. In that method, there is a check for that is throwing the error. It may be a timing issue. Don Murray Ticket Details =================== Ticket ID: KOK-358567 Department: Support IDV Priority: Normal Status: Closed