I am having the same issue as denley. I have done what Eric suggested and tried to use a static chart but that gave me the same "undefined" where the chart should be. Any ideas on what may be happening? The webassist wizard also freezes frequently causing me to shut down dreamweaver cs4 and start over.
I also get the following error when I open the page with the chart on it:
"This page contains some SWF objects that may not work properly in the most recent version of Internet Explorer.
Dreamweaver cannot convert them to the new SWF markups. Please delete each of them and insert again."