I didn’t know about those because I always manipulated the spline through blueprints. The input key is yet another property that cannot be modified through blueprints. It’s not even explained what an input key is. How are we supposed to know how to use it? The Spline is a great component that is poorly executed.
Thanks again for the information. I really appreciate that you posted this info for everyone to see.
PS: There are more bugs awaiting if you count on using splines further. You’ll start seing them if you want to do loops. Here’s one: Spline tangent problem - Rendering - Unreal Engine Forums