I save frequently, so this didn't cause me to loose a lot of work, but when I did try to save I got a window labeled "AutoCAD Message". Inside the window it says "One or more objects in this drawing cannot be saved to the specified format. The operation was not completed and no file was created." I am unaware of changing the "specified format" for saving. What changed? Yesterday everything was working fine. Even though I didn't loose a lot of work, I cannot save so work is at a standstill until this is resolved. Any ideas?