Loading this assembly would produce a different grant set from other instances. (4286763)

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Title

Loading this assembly would produce a different grant set from other instances.
Description

Attempting to access any ControlPoint ASPX page, or the ControlPoint Configuration Site, results in the below error:
[HttpException (0x80004005): Loading this assembly would produce a different grant set from other instances. (Exception from HRESULT: 0x80131401)]
System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +1139
System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +159
System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +746
Cause

A reference in the upper (Site Collection level) web.config for the ControlPoint Web Application to fail to execute for newer versions of SharePoint.
Resolution

1) Navigate to the server hosting ControlPoint, and open the IIS Manager Application
2) Select Sites, then right-click the ControlPoint Site and select "Explore"
3) Edit the web.config in this location, then search for the phrase "legacyCasModel". You should find an entry in the config file similar to the below:
<trust level="Full" originUrl="" legacyCasModel="true" />
4) Change the true reference to false, then save the web.config file.
**NOTE: You may need to repeat these steps for each Web Front End in your environment, depending on your DNS or Load Balancer configuration.

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