I have a blueprint with Spline component. This Spline component has many points and I want to change location of certain points during gameplay. So i call the Set Location at Spline Point node, but it just doesn’t work, nothing happens. I’ve tried with different points, both Local and World coordinates, different location vectors…
Is there some bug that prevents changing location of spline points via this node?
Can you show some screenshots of how you are doing this?
Sure:
But! I’ve discovered that it’s because my spline is set in construction script! Then its points become pink (instead of white) and spline isn’t editable anymore 
When I don’t add spline points in Construction Script, it becomes white again and Set Location at Spline Point works!
Looks like it’s a new change that doesn’t allow editing splines when they’re set in construction script: [4.9pre4] SplineComponents built with construction script are not editable - C++ Programming - Unreal Engine Forums
I hope that there is some workaround… Maybe through C++…
Problem solved, it was my mistake. Full information in my thread HERE.