The settings dialog will pop up and ask whether I will allow flash player to use the mic and camera. After allowing it, I get a RTE saying that the stream does not exist.
I looked at the 10.3 source code and figured that the problem in question was probably related to the dialog itself interrupting the request. I went into the global settings and changed the localhost setting from "prompt" to "always", so that the dialog wont' show up anymore.
After doing that, I don't get a RTE - (but I still haven't gotten the audio to work, for perhaps an unrelated reason)
Does this problem happen only with the Spark SDK or also with the regular SDK ? (I suspect it happens all the time).
If you are using ConnectSession instead of ConnectSessionContainer you should move audioPub.publish() in a listener for ConnectSession SYNCHRONIZATION_CHANGE (i.e. you should start publish AFTER you are succesfully connected to the room).