I have upgraded an HP Laptop to Windows 10. I have noticed that when I open windows the position is not the same as when I closed the window. Sometimes it is close. Eg with FF pushes the top up if any part of the bottom frame is below the taskbar. Windows Edge, the newly opened window appears to move about a bit radomly. If I open This PC (My Computer), position it at a certain height, then close and reopen, it is near the previous location, but about the height of the Windows Title bar lower. This can be repeated until it has moved a certain distance down the screen, then it jumps back to the top. This is like it is permanently tiling, except that I am closing each window before opening it again. Normally tiling only happens when you open one explorer or my computer on top of another. Wordpad and Notepad don't suffer with this. They close and open in the same locations.