X3 New audio glitch

1. Record midi-track-driven hardware synth to audio track. Audio wave created.
2. Set audio track output to sound card, solo & play audio track.... no sound.
3. Bounce clip & play.... no sound.
4. Process Normalize to bring up sound.... audio wave flatlines as if there's no sound.
5. Undo Normalize to bring audio wave back & play.... no sound.
6. Drag audio clip to bottom of screen forming new audio track.
7. Solo & play new audio track.... now I hear sound.
8. Drag audio clip back to original track.... I still hear sound as I should have to begin with.
 
Huh?????!