Replay Audio not saving in separate 'line'
I'm working on a project where I've recorded the screen with audio and this has landed on line 'A'.
When I need to update the audio, I'm recording new audio only (through replay) which stores on line 'B', and then I mute the audio on line 'A'.
This was working perfectly up until about an hour ago.
Now when I record audio on it's own it doesn't show on line 'B' (so I can't manipulate it), yet it still plays if a play the audio for the course. The only way to get rid of it is to 'undo'.
I've tried closing the program / restarting the computer etc. to no avail.