TLF Text ruined my life

I started a new project and forgot to choose to publish to Flash Player 9. The movie is running awfully slow and one solution I discovered is to go back to FP9, but I get this error:

1046: Type was not found or was not a compile-time constant: TextLine.

When I went to switch publishing options, I got a warning about abandoning TLF Text. Since I’m not using TLF in any text box in the entire project, I don’t understand why it’s screwing up now. Does anyone know what’s going on? Am I misunderstanding the issue in Publishing to FP9?