After a break from working on my game, I decided to upgrade the engine to 4.6 from 4.4.3. After the upgrade, all of my code is still in the project, which includes a Game Mode, HUD, Player Controller and Game State classes but none of these are showing up as available options in the Default Modes section in the Project Settings. I did try to create a new Game Mode and that didn’t even show up.
How do I get these classes to show up again in the editor? Is there a step I’m overlooking?