Before anyone starts requesting that Cal and pwiz update the trainer, there is almost nothing wrong with the current trainer. I just went 3 rounds with it and even used the new weapons and the game worked just fine, the only issue might be with the ammo codes. Even if they show you have 9999 ammo in the clip, not all the guns will actually read as such, and when you use up all your legitimate ammo the guns stop firing until you press the ammo key again to reset it. So far this is the only issue i have found with the current trainer+patch.
If your getting general fault protection from using the ammo cheats, there are certain combinations that will trigger a general fault protection issue when using the ammo and clip codes