I’ve been struggling with a disappearing radial sliders for some time now. Created a video here:
video
It seems to happen randomly when changing a value in the property inspector.
To save myself some time, I also tried to copy a working slider and renamed it, just to have a backup. However, sometimes when I copy-paste a working slider widget, the new copy is empty. Something is not right.
Using Create 1.0.0 dp-8.