When AutoCAD 2027 was first released with .NET 10 support, many developers encountered a critical regression: drag-and-drop operations from custom palettes to the drawing area would crash with an InvalidCastException. System.InvalidCastException: Unable to cast COM object of type ‘System.__ComObject’ to interface type ‘System.Windows.Forms.IDataObject’. QueryInterface call failed with E_NOINTERFACE (0x80004002).
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