RenderTexture not working in standalone windows 8

Hi. i am using Unity 4.2.1f4 Pro on windows 8, and my renderTexture just won't show up in standalone.

isit a problem with compatibility? when i tried the following (Javascript)...

 var renTex : RenderTexture;
 
 function Update() {
    while (!renTex.IsCreated){
       renTex = new RenderTexture(256, 256, 16);
       renTex.Create();
    }
 }

the system hanged. does this mean the standalone does not support renderTexture creating?

please help me. all my previous builds from windows 7 show the renderTextures correctly, and it works prefectly in Editor. Thank you for taking your time to read this...

//edited: code syntax error, but the code is correct in the project, it works just fine in editor without problems.