thanks for your post. We're currently investigating an issue where the audio blocker does not work. Could you add more details on this? Have you tried different audio interfaces like headphones or speakers?
You're right that running apps are not displayed at the moment, I've added this behavior to our feature request list.
You can try to click on the audio blocker and increase the blocking-time, maybe that helps if your music pauses for some seconds.
We'll inform you as soon as the requested features are implemented.