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JSON.Net throwing System.Security.VerificationException: Operation could destabilize the runtime.

I have a web application which uses JSON.Net to write out an array of data from a .Net Array().

When run in the VS2010 environment, it works fine.

When run under IIS6 and .Net 3.5, it works fine.

When run under IIS7 or 7.5 and .Net 3.5 when .Net 4.0 is installed (but the app pool and site is set to use v2 runtime), it fails with the exception 'System.Security.VerificationException: Operation could destabilize the runtime.'

I do not have access to an IIS7 (or 7.5) system without .Net 4.,0 so I cannot try that case.

Can anyone shed any light on this?

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