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Ok added re-spawn of volume handler and for now and made it non-threaded as the combination of both definitely didn't play well, this means during audio device overview loading and setting the playback device the UI will shortly "hang" depending on how many devices you have.

Make sure to set it to Master Volume in Mediaportal configuration, also disabled some startup things in plugin for testing purposes and if this solves it for you as well will cleanup a few things and push new release out.