I am upgrading to Kendo UI Pro 2015.3.1111 and have this error: 'Cannot read property 'draggable' of undefined' with the RangeSlider widget. This happens each time when I grab an end of the range and drag it.
I can reproduce the error by choosing to edit your example at http://demos.telerik.com/kendo-ui/slider/api and then running the example and sliding the range slider. I see the example is using the exact same version
Any idea when this would be fixed or is it already on the radar?