System.Reflection.MethodInfo.GetCurrentMethod.Name now throwing "Cannot Evaluate Security Function" error in Try...Catch

For the last five months I've been working on an ASP.NET 4.5 project using VS2013 Ultimate and Visual Basic. I've been developing on my location machine, using local ISS and a networked SQL 2012 server. 

I've been using the following in this dev environment to catch mistakes since I'm new at ASP.NET:

However, in the last couple weeks it has started to throw the following error: "Cannot evaluate a Security Function" 

This happens every time methodinfo is called inside that try...catch. However, if I declare a string and assign it inside the function, but above the catch:

DimcurrentMethodAsString

Try

      currentMethod = System.Reflection.MethodInfo.GetCurrentMethod.Name

      {insert code here}

CatchexAsException

            Trace.Warn(ex.ToString())

           IfShowAlertsThenSystem.Web.HttpContext.Current.Response.Write("<SCRIPT LANGUAGE=""JavaScript"">alert("""+ currentMethod +": "+ isNull(ex.Message) +""")</SCRIPT>")

I no longer get an error. But I don't want to be calling methodinfo unless I need to (it is very expensive, after all), and I really dislike the idea of creating custom error messages for every single method so I know what method triggered the alert message.

Similarly, an associate of mine linked me that he had a similar problem start in the last week of January 2015, with MethodInfo  sing the watch functionality of VS. He posted it at

https://social.msdn.microsoft.com/forums/vstudio/en-US/008a06ed-92bf-40b4-8bc7-a6286a394ec8/error-cannot-evaluate-a-security-function

I've found similar posts as far back as 2008 saying that you need to change permissions. That has not seemed to help. And it does not explain why I have suddenly had the error start only a few weeks ago after 4 months of not having the error.

Does anyone know what I could try to resolve this? 

Thanks!

--Cralis