Using labels for multiple exports

I am using windows 7. I have been making mp3 files of my favorite vinyal records using labels and exporting them using " exporting multiples". I have been really successful until yesterday. For some reason when I go to select by labels it won’t allow me to choose that. The one that is already selected is tracks. This only allows 4 songs to be exported. What did I do wrong?

Checking the obvious first. Does the project have labels?