Errors in Built Application in CurvySplineSegment

[_Aka_]

Many Unity API calls fail when called outside of the main thread. This Unity limitation makes running random Unity code on a secondary thread often problematic. One has to identify which code is safe for threading, run it on a thread, then come back to the main thread to run the rest of the code. When not having the time or ability to dissect the code, the safest solution is to run the code on the main thread.
Curvy Splines already parallelize most of the code which can benefit from parallelization. So running Curvy Spline's code on the main thread seems to be the safe solution.