‘Softie Rodney Viana has posted details and a workaround for the “System.CodeDom.CodeBinaryOperatorExpression is not marked as authorized” bug.

Apparently, installing last Tuesday’s KB 4457916 Security Only updates for .Net Framework 3.5, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, and 4.7.2 for Windows 8.1 and Server 2012 R2 causes a hard stop with any SharePoint Workflows. (Workflows are set up by an admin to handle the flow of documents through a series of steps.)

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