[Lew Silverman]

How are you enabling the low-side two-step for your launch? Are you using a switch at the brake pedal or a button on the wheel? If the only time the two-step isn't working is when you're staging for a run, I would check for battery voltage on the dark-blue wire to the box. The programmable 6AL-2 has both a launch and retard function. Once properly programmed, there shouldn't be any other reason for the launch-function not to work.

Lew