Amish_Dan-
I just restarted with new trainer and have not upgraded my rifle yet. When did it freeze on you? When you upgraded rifle? The game seems to upgrade whether I want to or not. Great work CH team for trying to get this trainer to function with the game. I only buy games that CH has trainers for - Love it!
On another note, the saved game file attached to this is great as well.
I did not 'purchase' any new gun. As you said, the upgrade became available. My ONLY use of the trainer was to add money, do 'fast' run ---- and 'freeze' animals. That was the extent of trainer usage --- because I was nervous about other features that were not basically necessary for me. While everything worked well for a while --- then the freeze/crash started. I could not relate the crash to any other activity.