I think that was just last year ? Last year he was swinging the ball both ways , well atleast in the One Day format of the game. I guess its something to do with his wrist action and from all reports he is working hard with Troy Cooley on that. Hopefully he can rediscover it pretty quickly. His natural angle across the RH is his strength and he will take lot of wickets if he can just get one or two to come back in to the RH. But you are right , without the swing he is pretty harmless in test cricket even if he can bowl fast.
Bollinger is in great form so I guess he should come in if Mitch can't get it right soon.