Changing the audio device while using Audio Splitting can cause the feature to stop working with newly launched applications that use the audio.
Making changes to the audio device such disconnecting and reconnecting headphones can cause the audio splitting feature to fail for any new applications used that make use of audio.
The issue has been fixed in the latest version of SuperNova.
If you have a relevant Software maintenance agreement you will be able to update automatically by checking for updates in-app or by downloading the latest version from our downloads page.