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When a system has one planet with a shipyard and then is colonized by a second race, the system name shows up as "<u>System_Name" on the main screen with the "<u" in one players color and ">System_Name" in the second players color.
I didn't fix this exactly, but I did change how system names are coloured so that neither the reported issue, nor the crash I got, should happen in the SVN version, although with the side effect of removing the system name colours from systems owned by multiple empires. A more proper fix should be eventually provided, though.