The flip toggle switches used to animate when you tapped/toggled them. It seems this checkin:
broke this because it sets the value (via refresh) prior to the animation being set up.
I have a fix for this.
The fix for this is on the 'transitions' branch and can be found here:
It can land on the HEAD once the $.fn.transitionComplete() method lands from the 'transitions' branch.
I landed the selector fix to enable animation on the HEAD:
Also landed a related fix that removed the bogus animationComplete() call. This was not necessary since an animationend event will never be generated for a CSS3 transition, and was leading to us binding a new handler every time the switch was clicked.