Hello,
Thank you for attaching your reports.
If I have understood correctly, in this quote: "The report DLL is installed and run on a desktop machine, the data is fetched using a Web service and the report saves an RDF file to the desktop machine"
The service that saves the report to RDF is using AR6?
Report saved in RDF format in AR6 is shown in AR2 viewer and then converted to PDF ? Please correct me if my understanding is wrong.
This behavior is expected since reports are not backward compatible and or tested with viewers of older versions. RDF file is just a canvas where reports controls are rendered/drawn along with data and they are also version specific.
You may consider upgarding your application, however I do understand that may not be possible. You can alternatively convert your reports directly to PDF and use them later in your application.
Hope this clarifies,
Best Regards,
Tuhina