I use Mathematica v.11.3 on a MacBook Pro (end of 2013). Starting two days ago the function Find does not work anymore: when I try Cmnd+F, the menu bar becomes blue for about one second, but nothing happens then. Does somebody have an idea?
I tried to reinstall Mathematica, but that did not solve the problem.
Also, I have another version of Mathematica (10.1.0.0) installed on my Mac, and it has the same problem.