Nevertheless, to answer the original question:
What are you using to split the PowerFLARM signal?
It is important to understand that you can easily have many "listeners" of a Flarm signal but if you have several that try to talk to the Flarm (like download a flight) you can get in trouble quick. LX dealers all sell "Flarm Splitter" cables which take care of that problem.
A use case where we encounter this most frequently is in a double seater with two Oudies connected to a single Flarm.
http://www.lxnav.com/products/accessories.html
Regards,
Andrej Kolar
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glider pilots use
http://www.Naviter.com