I have a VSTO (Excel) Application, and a Windows Forms application.
Both have the same config file sections. When I run teh forms application,
it behaves as I expect.

Running the same from my Excel project (VSTO 2005) I get An error occurred
creating the configuration section handler for 'My assembly': That assembly
does not allow partially trusted callers.

I have found a lack of help online for this error, but that I did find
(which suggests manually adding the dll's into the FullTrust group does not
work. They are all there, and all full trust / strong named etc, but the
system still throws the exception.

Any ideas or help in tracking this down ?

Thanks