Hi,
Not sure if this is a bug or not, but when I bought the DLC off of Steam a while ago, I didn't see "Forbidden Worlds" underneath the version number in the main menu. Yet some people have that string displayed under their version number.
Ironically, I can play on maps with DLC planets, make maps with said planets, among other things. Other than what the title says, I have no other problems with the game (which is the latest version).
I don't know if this post should go here or in the Technical section.....