After HF00370 is applied, print queue jobs are failing with the following error: Could not load file or assembly 'file:///C:\Program Files\Bentley\eB\Server\Engines\eB.Engine.InterPlotEngine.dll' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515)
Make sure the hotfix zip file you downloaded is not blocked. Right click the file and select Properties. Then click the Unblock button.
More details can be found in the following page: http://blogs.msdn.com/b/brada/archive/2009/12/11/visual-studio-project-sample-loading-error-assembly-could-not-be-loaded-and-will-be-ignored-could-not-load-file-or-assembly-or-one-of-its-dependencies-operation-is-not-supported-exception-from-hresult-0x80131515.aspx