HI, I USE THE STUDENT LICENSE FOR AUTOCAD FOR MAC, AND ABDRUPLTLY ONE DAY MY LINE COMMAND STARTED BEHAVING WEIRD EVERY TIME I ENTER A COMMAND FOR EXAMPLE- 5'<0 IT ENDS UP ATTACHING MY LINE TO XY AXIS, ALSO MY MEASUREMENT COMMAND GETS STUCK IN A LOOP WHERE IT ASKS ME TO TYPE IN THE TYPE OF MEASUREMENT THEN CHOOSE START POINT AND END POINT AND ENDS UP AGAIN ASKING FOR TYPE OF MEASUREMENT. I HAVE BEEN STUCK WITH THIS PROBLEM FOR A WHILE NOW, PLEASE HELP.