Flash Forms Stopped Working In ColdFusion 9

Question

We moved our websites, many of which use Flash Forms, from a server running ColdFusion 7 to a server running ColdFusion 9.
At first all the Flash Forms in the various websites worked fine.
However, on the same day all the Flash Forms stopped working on the ColdFusion 9 server.  No changes were made to the websites, to IIS 6, or to ColdFusion.  We've restarted ColdFusion, IIS 6, and the server.
The error we get when loading a page that includes a Flash Form is:
412 Unknown
Here is the output reported by FireBug when loading a page (for example http://www.futurefamilydocs.org/test/testflashforms/index.cfm) that includes a Flash Form
The same page with the same flash form works fine in our ColdFusion 7 server (for example see: http://test.futurefamilydocs.org/test/testflashforms/index.cfm)
We cannot figure out what the issue is.  Both servers are setup exactly the same Windows 2003, IIS 6, same ColdFusion settings, same access rights for internet users.
We'd appreciate any help as it will be significant work for use to change all the Flash Forms to normal forms.  We're a small non-profit company and this is having a big impact on our members until we get it fixed or replace all the Flash Forms.
Thank You
Bruce Phillips

Answer 1

We have found the error message coldfusion is generating when we try to access a page that has a flash form:
C:\ColdFusion9\runtime\logs\coldfusion-event.log
03/29 13:02:45 user CFSwfServlet: Error: The class  'mx.rpc.RemoteClassRelayResponder' could not be loaded.
03/29  13:02:45 user CFSwfServlet:  at  C:\Inetpub\wwwroot\futurefamilydocs\test\testflashforms\inde.mxml:393
I researched that error and found suggestions to redo the IIS configuration for ColdFusion.  I did that but still get the same error.