Two whole menus in Lightroom disappeared while I was traveling overseas: the Quick menu in the Library module and the Basic menu in the Develop module.When I installed the new version of Lightroom a few days ago, it had the same missing menus in the new version. I have a MacBook Pro running the latest operating system, OS X Yosemite 10.10.3. On my desktop, which is an iMac, I have no problems with either the recent version or the new version. I have no idea what could be causing this problem. Any ideas?
This happens to a lot of people, it is usually done via an accidental mouse click on the right hand side, which hides these areas.
In Library or Develop press Cmd+1 to get them back.
Or the top menu:
Window >> Panels