I can report the same issue at 16.04. Apps won't open where the mouse pointer is, they tend to open at the screen at the left, even when isn't selected as the main monitor.
Happening at KDE 5.8 with Ubuntu 16.04
I can report the same issue at 16.04. Apps won't open where the mouse pointer is, they tend to open at the screen at the left, even when isn't selected as the main monitor.
Happening at KDE 5.8 with Ubuntu 16.04