If your save file for Outbreak mode seems to have disappeared, not to worry! We've simply moved the folder in which those save files are stored. If you want to retrieve your save file, follow these instructions:
For Windows:
1. Go to your %localappdata% folder.
2. Navigate to AmoebaBattle\Saves\SavedGames.
3. Transfer the Adventure_*****.absv files in this folder to AmoebaBattle\Saves\Adventures.
4. Restart the game.
That should be it!