RenderTexture not working when in Editor

I've come to a point where my code works when compiled and run as standalone, but not when running within the editor.

I was wondering if there is something wrong in my code, or a limitation of some sort that I missed maybe.

Using the following code will work when compiled, but not in the editor. It's not a problem, as long as you know it does work in the end...

 function TakePreview () {
 // creating a Texture to Render to
 var myRenderTexture = new RenderTexture(128, 96, 24);
 myRenderTexture.Create();
 
 // Setting the Camera to Render to the Texture
 Camera.main.targetTexture = myRenderTexture;
 
 // Setting the Texture to be the Active Texture to read from
 RenderTexture.active = myRenderTexture;
 
 // Creating a new Texture2D
 var myTexture2D = new Texture2D (128, 96, TextureFormat.RGB24, false);
 
 // Wait for the Frame to be fully rendered
 yield WaitForEndOfFrame();
 
 // Read pixels from the Render Texture into the Texture 2D
 myTexture2D.ReadPixels(new Rect(0, 0, myRenderTexture.width, myRenderTexture.height), 0, 0);
 myTexture2D.Apply();
 
 // Reset Camera and Release the RenderTexture
 Camera.main.targetTexture = null;
 RenderTexture.active = null;
 myRenderTexture.Release();

}