[wthalliii]

It works fine. That would explain it, then. The ASUS monitor is 1920 X 1080, while the Surface is 2736 X 1824, so as you say, it must be reporting far fewer touch events.

Okay, I guess I need a 4K monitor with touch if I want annotations to work in that mode. As an alternative, I can use text and stamps instead. Fortunately, you provide many options for the annotations.

Thanks.