That was my first thought, I must have left the handbrake on but it was off, Then I thought I might have rode the clutch at little so I drove home and by the time i got home the smell was gone.
I think i found the source of the smell, my rear tire touches the belt when I am turning backing up. I had my wife slowly back up with the rear wheel cover off and the belt does touch the rear wheel.
So it is riding off the inside of the rear sprocket?