Some times some strange characters ( like any text ) come on screen during working, which only can be seen, but can not be removed, when you zoom it out, you will see & when you will try zoom in. it will disapears. What is that, it's just like illusion, How it can be removed emmufti20092009-06-10 10:16:44

This is usually a problem of your graphics card (driver) or the DWG file is not in the official (Autodesk genuine) format.