AutoCAD Drawing Opens Read-Only

When an AutoCAD drawing opens read-only in AutoCAD, even though it is a working copy for the current user, there are three possible causes:
 

• The drawing is damaged and needs to be repaired. To open the drawing read-write so that it can be repaired, close the drawing, disable the viewer in the PowerUser, and open the drawing again. Then use the AUDIT command in AutoCAD.
  
• The viewer in the PowerUser did not release the drawing fast enough when the PowerUser lost focus. Disable the viewer, and open the drawing again.
  
• The suspend resume viewer-option in the PowerUser is not enabled.