I was working on a drawing on my home computer and was entering a new command and the entire drawing disappeared from the screen. I tried everything and could not get the drawing back. I was able to pull up other drawings, but not the one I was working on. I am using windows XP. I have been using this program for 15 years and never had rhis happen. I am at a loss as to why. I need to get my drawing back. Please help.