The Enter and Return Key usually does 2 things: New Line and Carriage Return. Those are handled somewhat differently, depending what OS you're running.
On some applications (for example Photoshop), the Enter Key and the Return Key do something different, on Mac OSX, there's even fn+Enter and fn+Return (Photoshop does different things here again).
In WindowTester, see if it records something if you're hitting the Enter Key or the Return Key.
If works fine here, when I press the Return Key, it outputs:
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ui.keyClick(SWT.CR); // carriage return