I would like to chime in as I have the same problem as Vervex does. All toggle options, including freeze timer, can't be turned off once they're activated. My PC has an i7 870, a 660, and the OS is Windows 7 Home Premium 64 bits.
The way I stop this is by:
loading the game first,
loading my save,
going outside but not doing any actions,
alt-tab out (I play fullscreen),
load the trainer,
alt-tab back in and all the features work and no crashes