The second hand on my chronograph will not index properly when reset

Try this or some variation as it worked with my new Wenger Chronograph.
Pull the crown out to the first position (for changing the date) and press the top button - one of the hands - either the big second hand, the little minute hand, or the little tenth of seconds hand - should move one notch. Keep pressing until it reaches the desired position. Now press the bottom button, same process. Pull the crown all the way out and press the top button, same process. Then if that still hasn't solved it, crown all the way out and press the bottom button. Each position should correspond to a hand, and each press should move it one notch. When settled, push the crown all the way in and operate it normally.
Be careful not to press buttons when changing the date or time, and don't bang or shake the watch too hard while using the chrono. Also, don't play with the buttons or press them one after the other too quickly.