I have contacted Adobe support, they proposed to delete the preferences, but did not work, then to have a new user and try it from there. With the new user I got the complete menu, but have no access to my catalog and photo database.
Has anyone an idea how to solve the problem. ??????
Go back to your version of LR without the "Basic" menu.
Right click (or Cmd Click) on one of the other headings in the Develop Side bar (eg: "Tone Curve"). Then re-select the "Basic" box from the pop-up menu that appears.