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I am operating 3D Civil with Windows 7, 64-bit system.
Most of the time when I close a drawing, particularly when I have two or more drawings open, the program closes down with the following message "Autocad Application has stopped working - Windows is collecting more information about the problem"
I then have to restart 3D Civil. If drawings that were opened weren't saved info is lost.
1. How much memory do you have?
2. Why do you not save before closing down?
(I am just reading what you said.)
Bill