Running DNN 7 Pro in a multi-server environment so the sessionState is set to SQLServer mode to share across the environment. When I click the View Report button on the main screen, I see the following:
Unable to serialize the session state. In 'StateServer' and 'SQLServer' mode, ASP.NET will serialize the session state objects, and as a result non-serializable objects or MarshalByRef objects are not permitted. The same restriction applies if similar serialization is done by the custom session state store in 'Custom' mode.
[SerializationException: Type 'Dataspring.DNN.Modules.OptInAdvancedEmail.OptInPreviousDistributionTrackingInfo' in Assembly 'Dataspring.DNN.Modules.OptInAdvancedEmail, Version=5.0.1.38044, Culture=neutral, PublicKeyToken=null' is not marked as serializable.]