If you have the JavaScript Debugger from Acrobat active and it disappears when you click components in the LiveCycle Designer ES interface, you must stop the Acrobat.exe process in the Microsoft Windows Task Manager. The Acrobat.exe process continues to run after Acrobat is closed so that Acrobat is displayed faster if it is restarted. Stopping the Acrobat.exe process ends the association between the JavaScript Debugger and the Acrobat Professional session so that you can use the JavaScript Debugger in LiveCycle Designer ES.
See also 

To prevent the JavaScript Debugger from disappearing in LiveCycle Designer ES