No info, and no reliable (identified) sources cited. Photos of the launch show the second stage burned as normal, so that seems to indicate that the launcher wasn't a major issue. And the second stage de-orbit burn was also photographed, and looked like all the others I've seen. Separation of Zuma from the second stage could have been a problem, of course, or there could have been an issue with Zuma itself.<p>Satellites tend to be reflective due to their use of solar panels, and amateur astronomers track just about everything people launch. Heavens-above's track data[1] doesn't get filled in it either failed or is very low-observability and using an RTG or similar instead of solar power. It's also possible that the payload is in orbit, but couldn't get to the correct orbit, in which case track data will get filled in but the satellite still will have failed...<p>[1] <a href="http://heavens-above.com/SatInfo.aspx?satid=43098&lat=0&lng=0&loc=Unspecified&alt=0&tz=UCT" rel="nofollow">http://heavens-above.com/SatInfo.aspx?satid=43098&lat=0&lng=...</a>