reverse playback problems

reverse playback will not work

hey, im having some problems with the reverse playback function in ntrack studio. i have selected the part of the track that i want to have reversed, and i go to track/special/reverse playback and the screen kind of blinks and then nothing happens and the selected part of the track is exactly the same as it was before. does anyone know how to solve this problem? thank you very much.

-Miles