As I'm sure you have noticed, last week a small hotfix style patch was released on the 28th August.
Can confirm that this patch fixed included the following fixes:
- Save Fix - Fix save game corruption issues caused by launching the latest DLC packages on older versions of the game.
- Save Fix - Added preventative measures within the save system to avoid corrupt or invalid data with certain controller configurations.
- Nvidia 3D VISION Fix - Resolved water corruption issues when racing in 3d splitscreen mode.
- Stability Improvement - Improved the stability of the game when using content from DLC packages.
Also, just an update but the team are currently looking into clutch issues with G27 steering wheels and we're hoping to release a patch for this soon.