One of the games I'm in has been on hiatus for a while, but it never actually stopped. Today, I noticed it was gone and thought perhaps the GM had decided to mark it inactive. However, it just got randomly moved down to my Previous Campaigns on the profile. I am listed as an active player on both the Players and Characters tab.
The game is Deadlands: The Flood.
If you make a post in the gameplay thread, it will return to Active status. If a game hasn't had a post in the gameplay thread in three months, it moves to Previous Campaigns automatically.