Fixing bipeds???????

[Limpmybizket]

I Have injected the arbiter, hunter, heretic elite, heretic grunt, brute, tarturous, miranda, and elite ranger into MP, but everytime I Inject a Marine or a Jackel, The game freezes when they hit the ground. I have nulled out all of the sounds in the dialog tags, but it still freezes, anyone know what my problem is? Or how to fix it?