You are running into a bug in AutoCAD. On a per-database basis, once a linetype is used for display in AutoCAD, it's data is cached and that cache assumes that the linetype will never be modified during that session of AutoCAD (that's the bug). That's why you must save, close, and reopen the drawing to see the linetype change - because that results in a new database in memory and then the old cached values are ignored and new cache values are created.
Is there already a solution to this bug? I have same problem on the linetype, and fixing it is a long process especially if the drawing has multiple tab and viewports plus the link. I thought it was the make of old version autocad.
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