Well, this usually happens in the process, where you have a horse plateau or even take a step back in what had been accomplished the day before. On the lunge line, he started out wanting to to take the left lead as usual, but stuck to it a little longer than usual. With ignoring the left lead responses and praising him and giving him a pet and a rest when he chose the right lead, he came on board pretty quickly.
Then I got in the tack and he did some more nice work as he did yesterday. At one point he even took the right lead off a straight line and over the 8″ jump. Relaxation and just allowing him to take the lead is a big factor for him.