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A coworker has 2014 civil 3d, and it's not acting correctly (as in not like my 2012 version). When you build an assembly, it doesn't show the link, just the circle at the end of the link? What setting is this?
First I'd verify you and your coworker are using the same "Code Set" controlling the display of your Assemblies.
Assembly Contextual Ribbon > Assembly Properties. Is one place to verify / change this.