about two weeks ago suddently to delete a charchter as normal with the delete key no longer works now it is the backspace key however I have to be past the text I want to delelte and move to the left? probably since the last update ...apple update- I spend the next 6 weeks fixing..whatever..then, new update, new mystery's --but it maybe something I did in hot corners or mission control settings- I have been trying to master that ..and not well, I might add....thanks--backspace delete which and why. how to fix.?