Webplayer displays garbage on Application.LoadLevel

I'm loading a streamed scene, but during the scene transition, the Unity webplayer displays all sorts of garbage until the scene loads (a distorted/flipped/flickering image, icons from the dock/taskbar that aren't even part of the game). Before the LoadLevel is called, the camera and all game objects in the scene are 100% stationary.

This is how the new scene is being loaded:

 IEnumerator LoadNext() {
   ...
   while( !Application.CanStreamedLevelBeLoaded( PlayerPrefs.GetString( "lvl" ) ) ) {
     yield return null;
   }
         
   Application.LoadLevel(PlayerPrefs.GetString("lvl"));
 }

Once the scene loads, there are no more oddities that are displayed. As far as I can tell, this is the only transition that has such an effect.

Has anyone else encountered an issue like this or know of a solution?