EDIT: Radius Networks has confirmed that this issue has appeared in subsequent preliminary releases of Yosemite. This OS veesion blocks the transfer of iBeacon with an internal interface, but allows it to be used with external interfaces. Thus, you can add an external Bluetooth dongle, like the GBU521, and the transmission works again.
It should be a mistake in the code or something specific for your machine. We tested our Mac OS MacBeacon app on Yosemite and did not notice any problems.
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