When I enter with a user whose role is different to the role of Site Administrator, and go to My Profile Settings > Edit My Profile and introduce text in the "Description" field, that change I've made is not reflected in database or the moodle own when it returns to the screen of the user profile. I have set the debug mode to see if it gives an error and does not give any error message on screen.

If I log in with a user with Administrator role, I do not have that problem, I realize the change in the "Description" field and I reflected on the database and return to the page of the user data correctly.

Could it be any restrictions on the version 2.7.5?

Thanks very much