Hi
A couple of things you can try:
1. Try assigning serialize(/process_data/formvar/form-data/data/*,true) to a String variable (using SetValue), and then either VariableLogger or DocumentExport to check that the data is actually there.
2. Try using RenderPlus, which takes a slightly different approach to Rendering, and may (or may not) give you better results.
3. Try turning up the logging level in log4j config file to DEBUG, and see whether you get any information from Render.
You can find all the above QPACs at:
http://www.avoka.com/avoka/qpac_library.shtmlGood luck...
Howard