I think the abiltiies selection is buggy.
For instance, I selected the default Thalan race. I clicked OK until the "select number of opponents" screen. then I went back one screen to the "customise default race" screen. suddenly, all my Thalan abilities were DOUBLED-- +40 pop growth, +40 soc/mil production etc.
And then, when I went back a further screen -- to the "select your race screen"-- the Thalan's abilities had entirely disppeared to only leave "logistics +6" and a couple of other abilities.
This had become the "new default" and I had to delete the raceconfig files to get back the original.
frustrating!