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This problem arises when external references (Xrif) are used and its re-occurrence can be erratic.
It could happen even after opening and saving the drawing several times.
It relates to all OLE objects that can be inserted (images, Excel Spreadsheets, Word Documents, etc.)
If you have this problem, you just need to delete the file with .vbi extension and the same name as your drawing found in the same directory as the .dwg file.