I resolved my first problem by installing the 1.1.8.1 version instead of the last one so I can edit my pictures now even if I saved once.
But if someone knows how to make my homepages’s grid picture to be unclickable that would be awesome !
I forget to say something :
Even if did not save any modifications in Option Tree I can’t change the Option Tree > Settings
It does absolutely nothing when I click on “Add section” or “Add setting” or when I try to modify an exisiting setting.
Thanks everyone