the callsign switch is more than often B744, especially KLM,QFA,KAL and VIR. I've never seen it before on the B763 fleet but the comparison with the sbs is the interesting one as it showed no callsign corruption.
Can you explain why,when connected to the network my radarbox loses contact with an aircraft overhead and when I switch the network off, the aircraft re-appears. Sadly this has caused to be disconnected so I can actually pick up a/c near me !
Rgds