Capture noise print doesn't work the first time.
This has happened in CC 2017 and 2018. When I select small section of audio for noise reduction, then go to Noise Reduction process, it acts as if there was no capture of noise print. I try to capture noise print the second time and it works. The rest of the time Audition is open, there are no issues. Only when Audition has been closed and reopened does the capture noise print not work the first time.
