Odd Texture Behaviour when moving between Scenes

Hello,

I'm using Async Load to transition between two or more scenes. And I get a really odd behaviour in that some textures (normally just one, actually) doesn't load in correct and will appear Black, or it'll load in a completely different, random texture that's being used elsewhere.

Obversely this is a serious issue. Has anyone else got this issue? And what might be causing it? It's a hit and miss really, I can never seem to reproduce it. It is very random, but only occurs when I keep moving from scene to scene using Async, so I assume it has something to do with that?

To move from scene to scene, I'm doing this:

 async = Application.LoadLevelAsync(1);
 async.allowSceneActivation = false;
 while(async.progress < 0.9)
     yield;
 async.allowSceneActivation = true;