Sometimes, we came out of the game after make changes in the setup, and sometimes we forget to save de changes on it. I don't know why, but this always happens when we got a good setup. It would be nice that the game asks us if we want to save the setup before exit the game, only when we have made changes on it. Thanks.
If that happens, you can find the last used Setup as "tempGarage.svm" File in the ..\UserData\player Folder. Copy it into the Folder of the Track for that it was made and rename it if you want. Nothing gets lost.