Are you running at the same resolution?
With the same text scaling and browser scaling settings?
Is the browser forced to full screen? (If using browser)
Is the application forced to full screen (if an application rather than browser) if possible. If not possible, can you move it to a set location.
Although ... first advice would be ..... don't use co-ordinates. It is a horrible way to identify objects and always prone to fail. Should only be used as an absolute last resort if nothing else works and you have absolutely no other way of identifying something. I will even use key shortcut keypress sequences ahead of co-ordinates ....
