TDSE impersonation & snap in security

I’ve just finished upgrading a customer to SDL Tridion 2011 where part of the task involved migrating a custom application from Tridion 2009 server to the new 2011 GUI server.  The application uses the .Net Interop library in order to create a TDSE object.  When the code ran to impersonate the object the following exception was thrown with the message:

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