Re: chain breaking
Other than you putting the clip on the wrong way, I really don't know.
The closed nose of the link should go with the direction of travel. The other way, the clip can catch and release itself.
Do you have a link or two left from your kit? Go with no link! Read above....hammer,punch and a nut under the link/pin. It may seem hard but once it moves, you will see. Vise grips work great to close it when on the bike.