Waveforms aren't displayed correctly after relinking audio files
You can reproduce this bug in the Multitrack editor using the following steps.
Open a new multitrack session
Open a multi-channel audio file
In the 'Files' browser click the > to show all the channels in the audio file
Drag just one channel onto a track in the Multitrack editor
The waveform will display correctly
Close the session
Rename the audio file
Open the session and re-link the audio file
The Multitrack editor will now show all the channels of the audio file instead of just the correct one
This bug is still present in Audition 14.4
Matt Stegner commented
Thanks, I've verified and created a bug for this.