I did what Juanka said
I see that in WordPress 4.6 with ACF 4.5.3, I disable the “Disable the visual editor when writing” in the user option, the editor works fine, if I enable the option “Disable the visual editor when writing” the problems comes back again.
indeed it stops working when the visual editor option is active, thanks Juanka at least this is something.
Curious thing is that the option was not activated to begin with, so i activated it and saved the profile, then deactivated it and it started to work again.
