I'm running Skyline in 10.3 using Windows 10.
I am using SRTM data and a point file with 2 records. When I run in ArcMap, I get a general function failure.
I tried running in ArcScene, and I get an output with no geometry, and the attribute table says each record has a value of -1.
I have run visibility and viewshed using this exact data and have no trouble. I also made sure that the elevations of the point file are higher than the actual elevation.