Seems to be broken for at least the 7 bus on two recent days I tried to use it. Most of the time it shows only northbound buses. One would think that what goes up must come down. Just minutes ago I missed a southbound bus from my corner just as I stepped out my door, even though there are no southbound buses on the map at this moment.
Seeing the same problem on the other site that uses SEPTA's data feed:
Real time SEPTA bus, trolley and trains in Philadelphia, PA - Skookul.com