Maybe related to issue 163006  	

On a Windows using CP1252 as ANSI encoding,
Create a Java project
In the main class, put the follwing main method:

    public static void main(String[] args) {
        System.out.println("héllò");
    }

Do note the 'é' and 'ò'.
It is not necessary to save the file 
Just press the 'Run' green right arrow to launch the project.
You should see the following in the console
  run:
  héllò
  BUILD SUCCESSFUL (total time: 0 seconds)

Now, make the editor with main class to lose the focus 
(click on another windows)
Repress on the 'Run' green right arrow all return in order 
(i.e. the console with the following)
  run:
  héllò
  BUILD SUCCESSFUL (total time: 0 seconds)

To reproduce again, just add a space somewhere in the main class
and repress on the 'Run' green right arrow.