I have been having multiple issues with saving my drawing files in AutoCAD 2013. My computer was replaced at work on 3/13/14 and at that time AutoCAD 2013 was installed. Prior to that I was using Version 2010 with no issues. When trying to save my drawing, I receive different messages, such as "One or more objects in this drawing cannot be saved to the specified format. The operation was not completed and no file was created.", or "Drawing file is write protected." I am unable to save my file even when I change the name of my drawing. Finally after multiple times of trying, it appears that my drawing is finally saved, but then when I reopen AutoCAD to work on my file again, I receive the message, "Drawing file is not valid." Worst of all, the drawing file is now blank. Nothing was saved and my original drawing is now gone. This has happened on three seperate drawing files now. The drawing files are not new. They are my base maps that I use as a starting point for all my projects. What could be causing this issue?
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