Bruce,
I solved the issue, I think. When calling this NetWebForm, I had the procedure name set to DataMenu but the Equate was set to procDataMenu. See the attached image. This worked in NT 12.19 but gave the error in NT 12.41. I set both the procedure and equate to DataMenu and the error went away. Perhaps NT 12.41 handles the procedure and equate fields differently?
Thanks,
Jeff