We just released FS 2016 R1.8, and FS 2018 R1.3. Both fix a number of bugs that came up over the last few weeks.

Download versions:

FS 2016 R1.8 (released 2018-08-15), which calculates distances on the FAI sphere: http://fs.fai.org/trac/wiki/FS2016R1.8

FS 2018 R1.3 (released 2018-08-15), which calculates distances on the WGS84 ellipsoid: http://fs.fai.org/trac/wiki/FS2018R1.3

If you want to know the usage difference read this article:  http://fs.fai.org/trac/wiki/WhichVersion