That seems fine, there must be something else wrong then.
As I said, I suspect that the engine passes some strange / unusual / wrong data to the shader, maybe the transformation matrix is not intended to be used that way in the post-processing stage or something. Not sure, though. Unfortunately I've met nobody so far who could confirm or explain this.
Edited by Meltac, 17 August 2014 - 07:36 AM.