Bouncing files in Logic Express 9

I am using Logic Express 9. I brought some GarageBand files into Logic to mix. I then bounced the mix to an AIF file for mastering. Later I decided I didn't like the mix and decided to remix the song. I bounced the new mix to a new AIF file but the new AIF file still plays the old mix. I even trashed everything in Logic Express and went back to square 1 and started all over again. But every time I bounce to an AIF file it still plays the old mix. Why is this happening? How can I get it to recognize my new mix? Please help.

Thanks in advance.