@cfc First of all, I got to say thanks for being so active on these forums and for addressing comments as they come up! Great app too!
I noticed that if you have the voice command on for pause/resume the activity that is stops the audio from other apps (in my case, a podcast). The podcast won't continue playing after the voice command is finished. I tried to restart my podcast from the now playing feature and also tried by reopening the podcast app but neither of these solved the issue. If you turn the voice commands off for play/pause, there is no issue. Somehow the two sources of audio conflict with each other.
Sorry - this is a bug in the current version. Apps need to negotiate with spoken audio in a different way to music and it is not doing this correctly. I have fixed it in the code, so it should be ok in the next version (with the Apple podcast app at least).
Sorry about that.