well i am not the alien guru, but ill give this one a shot.
im guessing that you are just missing a step, ill list all my steps down and you can see which one ya skipped

heh
1st you want to enable Gold pre-big bang which is option J
then it will ask to clear all custom stuff to inactive. sure, you can activate whatever you want later. it now says internal alien processing disabled, to run standard twars aliens, you must enable internal processing before completing big bang. but we dont want standard, we want gold aliens. now we bang the game.
we go into the gold alien manager. here is the settings i will use just to make them appear right away and to have them be active on day one, they are by no means what you NEED to use, just what will get the job done.
ill use the alien traders. which are the first alien race.
there are the settings i will use:
page 1:
C:0
D:1
E:50
F:100
I:2
L:YES
page 2:
C:No
D:YES
E:YES
L:YES
page 3:
D:(b)9999
page 4:
all 0 days
page 5:
nothing changed
page 6:
K:YES
now i will go back to general editer and goto option G.
i will use option P to make the game about 25 days old.
just to make sure they are out there, heh
turn on the server... look in my alien manager (bottom left corner) and wow, they are super active... anywho, do that, see if you can get aliens to be in game, if so, they you can change around the edits to what you prefer them to be.
Slim