Some user doesn't see menu buttons for fields like Image, Rich text, etc. in content tree. I mean Browse, Open media library, Show editor and other buttons above those fields of an item.
Everything is fine with security acccess to item field (user is able to edit), and to the each button. Moreover, renaming user login in database solve this problem, while renaming username back to original makes buttons to disappear again.
I used sitecore query to find any items that has security restriction for that user but nothing is found. I can create new user with the same roles set and buttons will be visible, but I need current user to be "as is" - it is on production.
Could you please suggest some ideas?