Sorry to hear that, Enderslime! Do you know which star you weren't able to get? I haven't had any other reports about a problem like this, and the code around the stars is quite simple, so offhand I don't have enough starting information to have a sense of what happened.
I would love to help, but i dont know which one it was, because i wasnt really paying attention to the order, meaning that i would go to places that i had already gone to and forget which ones i got and which ones i hadn't. If there was one missing, i would just think i had already gotten it, and i wasn't always checking my inventory, so i couldnt see if it just didn't register :/ . Sorry i couldn't help.