Shogun 2: Total War - Fall of the Samurai Cheats
I am on the latest version of both steam and Last Samurai. I was able to play the game fine with the trainer so long as I did not close the game and load my save. After I did that there was nothing, no combination of trainer options (or no trainer at all) that would prevent the game from crashing after I ended the turn.
The following link kills some temp files, I have not experienced any adverse effects from following the instructions.
Let me know if it works for anyone else, this was driving me crazy. I could play for hours using the trainer but if I stopped for the day and loaded my save the next day it would always crash. I tried many fixes, this was the only one that worked.
The trainer will also not necessarily work with the the torrent version of Shogun 2, so don't expect to get any support here for it.