I am a contractor that does work for several different companies. When these companies send me their dwg file I have no problem opening them up to edit them, but once I complete my edits and email the file back to them they are telling me that their autocad crashes while trying to open the drawing or the whole computer itself. Most recently I only made a very minor edit to their dwg which was editing two areas of text and still crashes their computer when I send it back. I am using Autocad Lt 2013, while they are using autocad 2010. I backsaved the file as well as purged the drawing after I was finished and still no luck. Also I noticed on another job after doing very minor edits, once I saved the new version, the file size multiplied like ten thousand times its size. Anyone know what may be going on?