Line weights not plotting correctly - User says that all line weights on the plot come out at weight 0 even though there are many line weights greater than 0 in the design file.
The print preview also shows the line weights as though they are all weight 0.
User had "Line Weights" box unchecked under "Settings>Print Attributes" on the Print Menu.
Once this was checked, the line weights appeared correctly in the preview and on the plot.