Unable to press SHIFT to unselect

[Hardney]

Hi,

I just reinstalled AutoCAD Land Desktop and when I window objects to select them, I just cannot make another window while pressing SHIFT to unselect unwanted items, it happened to me before but now I just cannot find what option to toggle on or off.

[chrisdarmanin]

try in options > user preferences > standard windows acellarator keys

i'm still a novice so i could be wrong in anything i say...

[eldon]

Try setting the PICKADD system variable to 1. This allows items previously selected to be deselected when the SHIFT is pressed.