Masklings like a little more territory around them than villages. Could be that there just wasn't room in the world, especially on a contents map.
Yep that was the problem! was on a mediteranean map, i've just try on mesopotamia and everything was fine^^ thank for the help.
Realy like the happiness mod btw, i t give me more liberty for desining my city wich i realy like. What are you going to do with the happiness building if you implement it in the base game btw?