Has anything been done concerning this issue? I'm having the same problem. An ASP.NET chart that works 100% on a development workstation, both in Visual Studio 2008 and 2010, 64-bit Windows 7, refuses to run under IIS7 on a 64-bit Windows Server 2008 R2 Standard. This has brought a concept project to a complete halt as no one can review the site on a production server. If I can't get this resolved, I'm going to have to give up on FusionCharts and move to something like ChartFX. I'd really hate to waste all the development time I spent implementing FusionCharts under ASP.NET using the DLL wrapper. Not to mention the money spent of licensing. A prior project worked fine on the server when using the standard JavaScript but I really needed to use the .NET approach for this one. I'm assuming this is strictly a FusionCharts.dll issue.