for people who have trouble unlocking traits
i could resolve it by loading a save from version 0.91, and then using that same save with the latest version (just before we answer Zoey's call), and i could unlock both trait without any bug or error.
edit 1: i noticed that there's a bug ,I lost 3 power points (7 to 4) by loading my 0.91save in 0.93 but i could obtain a 5th and unlock both trait without any cost.
Seem's like power points gain in "Meeting the Boss", "Testing the Waters" and "Lessons in Spirituality". are lost, like Emilia's affinty and trust point gain in that events.
Also impossible to load a save during these event, but it's fine if we load a save just before (in the appartment) an play them with the latest version to avoid to lose these points.
edit 2: I tested a new game with 0.91 (a save first screen) an then load it with 0.93 to avoid any lost point or anything else, and it worked fine, could play the game normaly without any bug or error (except that the points for buying traits are not used) but they can be unlocked without any problem.