Not sure why, but my PA:T only launches as regular PA, and there's no way to change it back in the settings. I do own the original game (and Titans, obviously), and I know i'm not launching the base game. Not sure what the problem is, or if I could even fix it. Thanks for any help!
Please open a new ticket at https://support.planetaryannihilation.com/index.php and select "Lost Titans Ownership" from the help topics.