I adjust Warp Marker on Audio Track and file iis erased?

[bionicLOVEsoundsystem]

I am baffled.
I go to adjust warp maker on a recorded audio track &
as soon as i do that the audio disappears from the
track. you can still see the waveform on bottom screen
where adjusting warp marker but empty box on the
audio track (this is in arrangement view).
never had this happen before....
???