Thank you for getting back to me!
I have replaced the DynamicWebCharts folder as suggested, but there was no change. I also made some more test purchases just in case, but again no change.
I am not sure how much help this will be, but using the Firefox browser the charts display part of a error message, I have included a screen shot to show this but just in case it is as follows.
../DynamicWebCharts/Data/Products_Chart_Results_dataparser1.php?GET=Search.x=1§ProductSKU=1269222