If it needs both GD and Gzip to run then that would explain it, my ISP says that Gzip is not enabled.
I dont actually want to use the PDF functionality (Which is what I thought Gzip gave you) I just want to save the charts to JPG with the click of a button so I can then use PDFLib to import them and other bits into a report, I assume that this is not possible as the exporter wont run without Gzip?