A hotfix is now available to address an issue in AutoCAD 2012 and AutoCAD 2012 vertical products with saving a drawing while the Block Editor is open.
Autodesk 2012 Block Editor Save Corruption Hot Fix
When a drawing was saved from within the Block Editor, the entire contents of the drawing was sometimes lost and replaced with the content of the block being edited.
Refer to the accompanying readme file for installation instructions.
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