We recently upgraded from PB 2019 to PB 2019 R3 (2670), and we're seeing a strange issue with response windows moving after they are opened.
Specifically: if the window has any opening animation specified, then the window will open in a location other than the centered position on the display. If the window is not marked as "Center", then the window will open in the upper left corner of the display (probably X=0/Y=0), and then when the animation is done, it is moved to the center of the display. If the window is marked as "Center", then the window will open closer to the center of the display (but still off), and again move to the center once the opening animation has completed.
Windows without animation will open centered as expected.
I've created a small application (PBL attached) to demonstrate this concept.
Not sure if I am doing something wrong (very possible) or if it's a bug. We can easily work around it by not using animation to open response windows.