Well, I looked a bit more carefully and found that the General.txt file for the Darloks has "Gas" for planet type instead of "Gas Giant".
Which probably explains why the game tried to start them on a warp point before I noticed it.
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"What do -you- want?" "I'd like to live -just- long enough to be there when they cut off your head and stick it on a pike as a warning to the next ten generations that some favors come with too high a price. I would look up into your lifeless eyes and wave like this..." *waggle* "...can you and your associates arrange that for me, Mr. Morden?"