In Microsoft Office Visio 2003, when your drawing contains objects that use a dashed or a dotted line pattern, and you copy and paste the objects to a Microsoft Office document or to a document in another program that supports linked and embedded objects, you may find that some of the embedded Visio objects appear with a solid line pattern. Objects that use a line pattern with thick, short lines retain their formatting, whereas objects that use a line pattern with thinner, longer lines do not retain their formatting. The line pattern of these embedded objects are converted to solid lines.
You may also experience these symptoms when you export your drawings to Windows Metafile (.wmf) format.