Andrei Rinciog [Extend Studio]
The window that opens the chart preview has a limited width that is less than 900px. That's why you can't see the entire chart and the exterior labels get cut off. However, this shouldn't happen in browser. Does it happen when you view the chart in browser as well?
Normally, when you have a big label, its cut in half and part of it is displayed on a second row. You can also select to have the labels placed on multiple rows from the "dataLabels" tab.
The export feature needs to use a second swf file that handles exporting. That second swf receives the data from the first and allows you to save it. However, it doesn't know how to extract data from the first chart, it only knows how to get data.
I can help you with this if you want.
Tell me if you need more help.