I've replicated your problem. It looks like a bug. The right engineer is busy right now, but I'll talk to him (and submit a bug report) later today. We are thinking that there will be a bug release sometime in the next couple of weeks.
I'll have to say "Mea Culpa" to the Sound Alarm. I'm thinking it must have been broken in the last update. We are on it! And thank you for the files. We can replicate this all the time now. I'm actually the one that signed off on the testing, so I missed it.
SparkPlot LIVE does work in our demo applications and I checked with Faraday and he says it is working fine in BeaconAir.
Sooooo, I make the usual request. Send me a copy of your Local.py and your XML from the App and I'll look at it.