s.click(img) is not working consistently

I think that clicking behavior has occurred before a mouse move to specified image.
Try to use mouseMove(img) and mouseDown(Button.LEFT) instead of click().

This way is also not working consistently. am seeing the same behavior with this approach as well.

Any other valuable suggestions please

Let's use debug.on() to confirm what is occurred.
http://sikulix-2014.readthedocs.io/en/latest/scripting.html?highlight=Debug.on

On Debug, I found the following error:

To inform, am using TestNG with this.

error] RobotDesktop: checkMousePosition: should be L(353,324)@S(0)[0,0 1600x900]
but after move is L(353,320)@S(0)[0,0 1600x900]
Possible cause in case you did not touch the mouse while script was running:
 Mouse actions are blocked generally or by the frontmost application.
You might try to run the SikuliX stuff as admin.

Sometimes, no error is showing up in log file, How ever mouse is moving to the intended location, But not clicking on it.

Since the setting of the display may be related, I show an example on my environment.

Also on my environment,when I changed magnification of display at size display setting, similar phenomenon occurred.
  magnification :150%, similar phenomenon occurred.
  magnification :125%, similar phenomenon did not occurred.

Infact image is being identified and cursor point moves to the exact image, but not clicking the image (sometimes).

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