Hi,
Thanks for the details, I have found the problem!
It was due to two missing values, which might have got deleted by accident. I’ve changed back those two options to the default values: http://i.imgur.com/mN9XvgX.png
It yielded an error whenever the plugin tried to de-code the search data, causing a script failure.
The error from the console disappear, and now the sliders should be working again.