GTE Traction Control Fault

[Tarmac Terrorist]

Has anyone else experienced this or do i need to re-download the GTE cars? What it is a fault with the traction control that I have found on the Porsche, Aston Martin & Corvette but not on the BMW.
What happens is I use the onboard TC control to adjust yet the car most of the time doesnt respond, its very annoying on the start line because I use TC overide to get a good start but still have TC for the race, however when I press the button most of the time it does nothing to cut out the TC, its weird cause every now and then it works. Is this just me or is it a bug with the cars?

Cheers!

 

[Tarmac Terrorist]

P.S. I am also getting a failed verification error message when trying to install the Aston from steam. The only way I can actually get it in game is to go to my inventory find it and click install on it, ive tried uninstalling it and letting Steam reinstall when the game starts up several times but always get the same, which seems odd as this is content ive paid for, it came in the Two Strong pack.