StreamingAssets with OSX

Hello,

Something very strange is happening to me. I am creating an OSX app, building the player and then executing it on the MAC. Everything works fine: I can see all the Streaming Assets (some textures). However when I create a .pkg of this .app and install it as an Application, I execute it and the Streaming Assets are not being found. I activated the Logs and what I get is this error: Couldn't open file /Applications/MyApp.app/Contents/Data/StreamingAssets/Subfolder/MyTexture.png. The path is perfectly well so I do not get why is this not working. The code related to this is the following:

 string sFinalPath = "file://" + Application.streamingAssetsPath + "/" + sTexturePath + sTextureName + ".png";
 m_WWWLoader = new WWW(sFinalPath);
 
 yield return m_WWWLoader;
 
 if (m_WWWLoader.isDone)
 {
    Debug.Log("============> Loader done with error (" + m_WWWLoader.error + ")");
 }

If anyone knows what is going on please tell me :)

Thanks in advance!