If I'm right, Rights of Passage and Mutual Protection Pacts are expected to expire after 20 turns (unless not extended). Sometimes I find myself with such an agreement with another CIV, and watching it from the Diplomacy Screen (actual agreements), I cannot see how many turns it will lasts, I cannot finish it or break it, it just lasts forever. Sometimes, I would prefer to stay in peace cause I'm so weak or in Democracy, but this unwanted MPP brings me into war. This doesn't appen always, just sometimes. Is this a bug? Does anyone know something about it? Or maybe these agreements do last forever and must be broken to end? I'm playing PlayTheWorld, v.1.21f.