Audition will not let me time stretch

Hi -

I'm trying to time stretch a clip, but Audition won't let me. I select the correct tool, I get the time strecth cursor (the one with the clock) and I stretch. Visually, it looks like the waveform is being stretched, but as soon as I let go of the mouse button, the waveform snaps back to its original. If I was trying to stretch longer, it just adds silence to the end of the clip. If I was trying to compress, it just truncates the clip based on where I released the mouse. I also noticed that when I right click the track in multitrack view, the third selection, "Clip Time Stretch Properties" is grayed out.

I searched the forum and found someone else having the same problem, but no answers.

I appreciate any help!

Mike