WWW streaming ogg video problems

I am trying to display a ogg video stream as a texture on an object using WWW. When I use an ogv file (file://path/myfile.ogv), everything works fine. When I use a video stream (http://mycomputer:8080), isDone is never true, isReadyToPlay is never true and yield return on the object never returns although the video will play fine most of the time if I go ahead and just use it without the checks. Sometimes though it will cause the editor (or the build) to just crash. Why doesn't it work with a stream? coroutine code:

 IEnumerator StartVideo()  
     {  
             wwwData = new WWW(sourceString);  
 
     //        yield return wwwData; - this will hang
             yield return new WaitForSeconds(3.0f); // using instead
 
     //        yield return wwwData; - this will hang
     //        while (!wwwData.isDone) -- this will never complete
     //    {
     //        yield return new WaitForSeconds(1.0f);
     //    }
             if (wwwData != null)
             {
                 movieObj = wwwData.movie;
                 string error = wwwData.error;
                 if (string.IsNullOrEmpty(error))
                 {    
     //                while (!movieObj.isReadyToPlay) - never completes
     //                {
     //                    yield return new WaitForSeconds(1.0f);
     //                }
                     renderer.material.mainTexture = movieObj;
                     movieObj.Play();
                 }
             }
     }