Now that the game has been released on Gamersgate and I have it fully installed and started playing it with the trainers I've found a problem.
The normal trainer doesn't work for me (Gamersgate version). The Retail Box does, but if I have the Health option on, then when I freeze a zombie using the Extinguisher and then hit the zombie to break it, the game crashes.
Yeah, it's only the Ultimate Trainer that causes this problem (the trainer just has to be activated to cause the crash). After I reverted to the Mega Trainer, no crashing occurs when shattering zombies. So I guess on of the new features that was added to the Ultimate Trainer is to blaim?