Well I've tried it all and the problem still exists.
I have:
Reinstalled DX11.0 and 9.0c.
Reinstalled the program.
Updated my graphics driver.
Reinstalled PhysX.
Turned XP compatibility mode on and disabled desktop composition.
The only thing I could not do is change the PhysX settings in my graphics as I have a Radeon card.
It is exactly like the others mentioned about being able to move forward when the slope is down but not up.
Unless there is any other ideas I might have to email Larian Support and see what they have to suggest.
