Aircraft using VFR Flight following not showing up.

So far this year VFR private flights with a flight plan and flight following active are not showing up at all when I try Live Tracking. What happened? This used to work fine. Check N84309 on 1/12/11 18TE-KSLR-KTXK-18TE and 1/13/11 N84309 18TE-KADH-18TE.