I have replied to your support case and I am going to put the answer here also.
This is a wellknown problem with PDF-printers. Many PDF-printers do not handle transparency and gradients very well. The selected style for the pie chart in this application uses transarency and gradients for visual effects. There are two work-arounds for this:
1. Use a more basic chart style without transparency and gradients.
2. We have an "Easter egg", SlowPrinting. If this flag is set, we render to a bit-map internally and handle all the tranparency and gradients. The bit-map is then sent to the printer for printout. This generates a much better printout. The downside is that it requires more memory and is far more time consuming.