I have been experiencing the same problem as Bobby when using two graphs on the same page, both in my own application and also using the example he supplied. I only downloaded the trial of FusionCharts two days ago so I have the latest version of the js file.
I've found that if I install the example code on a Win2K server and attempt to refresh the page from a workstation, then I see the out of memory error. However, if I run the same code from the C drive of the same workstation, then the error does not occur. If I log on to the server and invoke the page from IIS Manager, then I do not see the error. I have tested on other workstations and experienced the same problem.
I am going to zip and send the tested code to your support email account.