I think there's a bug in r138 concerning the Audio.
Cocoon Launcher reports this error:
at new C2AudioBugger (c2runtime.js:16587:35)
at instanceProto.getAudioBuffer (c2runtime.js:17799:7)
at instanceProto.getAudioInstance (c2runtime.js:17815:16)
at Acts.Play (c2runtime.js:17942:20)
at Action.run_object (c2runtime.js:11990:15)
at EventBlock.run_actions_and_subevents (c2runtime.js:11588:38)
at EventBlock.run (c2runtime.js:11566:9)
at EventBlock.run_subevents (c2runtime.js
in r137 the project works well (it preloads and then play a song)
in r138 there's this error and the preview (in the launcher) stops.
Sorry for bad english.