Default Line Styles - Displayable Corners

I am having issues when drawing rectangles.  When I  draw a rectangle using a default OOTB line style and then plot it, some corners are not displayable.  I found this article http://communities.bentley.com/products/microstation/w/microstation__wiki/obtaining-displayable-corners-with-custom-linestyles-tn.aspx but this doesn't help me as I am not using a custom line style.  The scale of the default linetypes I am using has been set in our plot driver, is it the scale that is causing the problem or is there something I can change to make sure that my corners intersect?

 

I am attaching a copy of the plt file I am using in the hope that someone will be able to give me a solution to this.  Thanks in advance.  By the way I am using Microstation V8 2004 in V7 workmode.

shaunA0.plt