Since it is Friday afternoon and who needs work, I am playing with the window move issue on a Mac.
Here's what happens:
The first time you select the window and select the vertical movement option on the pet palette, entering a value "y" will move the window correctly, relatively.
But not the second time if you don't deslect the window and start again.
Duh.
What works flawlessly for me is:
select windo
select vertical movement in pet palette
enter "Z" value for relative height change.
So don't mess with a combination of mouse and 'r' values. Use 'z'.
Dwight Atkinson