I have IntelliJ IDEA Ultimate Version 2016.1.3 when I opened it today, it won't respond to the mouse/cursor. The menu bar at the top works, as do the x, -, and + window buttons, but nothing actually inside the windows will respond to mouse clicks. The app does respond to the keyboard. So, for example, I can navigate using Tab, Enter, Esc, etc.
I found this StackOverflow post which seems related to my problem:
In one of the comments, a person mentions that the problem seems to be with using multiple monitors. When I opened IntelliJ, it did open up three previous projects that I had opened before, and they opened two were on one monitor and one was on the other. Unlike the commenter though, my problem was not solved by closing some, or even all of the projects and restarting in IntelliJ. It seems to be stuck in this state.
Also, the update is not working. If I select 'Check for Updates...' and then select the 'Download' button with the keyboard, I can see the download bar appear briefly, and then the initial window with the 'Remind Me Later', 'Download', etc. buttons appears again. So I can't update IntelliJ either.
I am running on a MacBook with OS X El Capitan, 10.11.6.