Most of our user base uses single monitors. All of our developers and testers use 2 or more monitors. We used to have bugs caused by the difference. An examp

Most of our user base uses single monitors. All of our developers and testers use 2 or more monitors. We used to have bugs caused by the difference. An example which comes to mind was an acknowledgement pop-up (something happened, click ok to continue) which would pop up on the other screen. For single monitor users, it would pop up off-screen. Because I'm a stubborn single monitor user, I was able to reproduce the bugs.