Layer slider problem

I am running Enfold version 4.5.2.

The “Enabled” button/slider to enable layer transitions is not functioning. I can disable transitions but when I click to enable nothing happens.

To recreate :

– Create a slide
– Create a layer
– Click Transitions
– Try and enable “Loop or Middle transition” – this just fails for me.
– I have tried in multiple browsers . and multiple machines.

Any ideas?

Thanks,
Elliot.