My coworker installed LenSlider (1.2 I believe) on a site he built, and when we updated the plugins recenly, LenSlider 2.0.9 doesn't work correctly. I was able to revert to that earlier version which is what the live site is currently using and the hosting company helped me create a debugging version of the site so I could continue to try to resolve the problem.
I did some checking with some of the debugging tools in the browsers:
I found that in the Firebug console, it gives an error that says:
Type Error: JQuery(…).tabs is not a function
then to the right, there is an url for the file in which the error occurs: [site url] /wp-content/plugins/len-slider/skins/vania_fit/output/js/custom.js?ver=2.0.9
In Chrome's developer tools, in the Scripts section, when I look at that same file, it gives a big red-highlighted error:
Uncaught TypeError: Object#<Object> has no method 'tabs'
In that same Chrome tool, when I look at the default-skin-custom.js, it does not give me the same Uncaught TypeError. Only the custom.js file does this. I know just enough to be dangerous, as the saying goes. But I'm hoping that I've provided enough info for a start but please let me know if I need to give you more. Hopefully this will help in improving the plugin as well. In case it is of use, the theme he built the site on is Rutherfordiumy, which is a free theme.
Thanks so much,