[Phlagm]

I've had this happen too. Lemme see if I can remember why. It had to do with a typo in the beginning of ...hmm...I'm not sure, maybe a race, or specific planet type. Oh wait, I think it happens if you typo a planet's file name somewhere. I think I got it because I had it spelled correctly, but it was a .tga instead of .jpg or something. It's been a while, but that was the source of my problems with this.