i played for 30 minutes, saving several times using all the trainer functions and i can load each and every save game with no problems.
if you are using a version of the game that is not the PAID FOR and PLAYED THROUGH STEAM then it could have been done incorrectly and causes crashes, bad saves. sometimes a 'fix' version is posted later, which seems to be the case here-
otherwise, i cannot reproduce save/load game crashes here with my legit STEAM version of the game.
I think it's not the trainers fault with corrupted savegames. Seems like the Game itself has much issues. I'm getting quite often CTD or even worse a crash where i have to reset the PC completely. This is happening if I'm using the trainer or not.
1. Unlimited movement = not unlimited. Move more than 15 spaces at a time it will crash. If you move 14 or less tiles it will work ok.
2. Faster building and research is great at the beginning of the game but when you get up in level it might take activation 2 or 3 times to get it to finish.
3. Policy and Golden age points are hit or miss. (when using it in game and you press the key for either sometimes you will get a lot of point and sometimes you wont get any at all) also these options have crashed my machine if I use them to much.
4. Money is great.
I also have noticed if you use the trainer over time the game will become unstable and crash. i have tried with and without trainer and it only crashes with trainer usage. (could be database issues with the game with all the information it is handling the trainer's wait timer might not be long enough.)
I noticed with lag with the game with trainer usage and without this could also be causing issues with trainer.
Getting the corrupted saved games also, but not completely sure who's at fault. Using legit Steam version of the game.
I do an auto save every turn along with a quick save at the end of each turn, because of the crashes. I can't load any saved game, going back a few auto saves, even after a restart and not loading the trainer.
So not sure what is causing the corruption of saved game files, but the game is definitely buggy with all the crashes. Might have to give them a while to actually finish the game. Still in Beta testing phase.