I have a set up with two monitors. One 1920x 1080 monitor and one 4k wacom cintique. I have the webbrowser on my 1920x1080 monitor. When I open a window like printing or writing a new message in my mailprogram a pop up windows appears. Often it pop ups in the 4K monitor and it looks normal but with the latest update the window is fine but the content of the ust 1/4 size of the monitor. If I drag the window into the 1920x1080monitor and the back it will get back to normal but it seems like some kind of bug there.

/ Mattias