I'm working with IDEA Ultimate 2016.3, Scene Builder 2.0-b20 on MacOS Sierra.
The drag & drop feature, dragging the controls from the left side panel into the scene seems to stop working after a while. I have to restart IDEA when this happens before they start working again.
Any pointers on why this happens or how to resolve it without having to re-start IDEA are appreciated.
I've attached a screenshot in case the explanation wasn't good enough.