Today when I click on a cell to enter anything, nothing gets entered but the
cursor acts like I'm trying to select a bunch of cells and keeps selecting as
far as I move the cursor. Can't even let go to close Excel or click save or
ANYTHING. It's as if the left click button was stuck down but it isn't
because it's fine in any other program. Anyone had this happen before? Can't
use Excel at all until I get it fixed.