Grips in different place to lines, move a little moves a lot, note crashes

In Draft sight I have just had the following happen, if I draw a line the blue grip squares appear to be some distance away. If I try to move the line a little it take off across the page. I have redown loaded DS and selected the repair option. Have closed and opened the drawing a few times. Have right clicked used copy and pasted init a new drawing all the same.   Put the same drawing in another computer and used it same result. Other thing that happens  when I use the a leader with a note DS crashes.Any one have any clues?