Trouble Cropping Texture2d Using GetPixels

I'm trying to crop Texture2D loaded from WWW into another Texture2D using the code below. The issue i'm having is when the length and width pass a certain value I just a grey (blank) texture back. I'm using it on Android if that makes any difference.

Texture2D loadedTexture = new Texture2D( 128, 128, TextureFormat.RGB24, false );
WWW.LoadImageIntoTexture( loadedTexture );

//Using hard coded values for testing, texture width and height exceed these
Texture2D croppedTexture = new Texture( 900, 900 );
croppedTexture.SetPixels( loadedTexture.GetPixels( 0, 0, 900, 900 ) );
croppedTexture.Apply( false );

loadedTexture = croppedTexture;

In my onGUI function i'm calling a draw texture on loadedTexture.

Edit:
I printed out the Color array from GetPixels and the colors are not all gray so I'm confused as to what is happening.