I am using CloudFlare and W3 Total Cache, and I finally got the slider and feature image zoom to work.
What I did was individually Cache Purge (in CloudFlare Settings Overview Tab) each of the old Customizr .js files in /wp-content/themes/customizr/inc/assets/js/ and /wp-content/themes/customizr/inc/assets/js/fancybox
wp-content/themes/customizr/inc/assets/js/bootstrap.js
wp-content/themes/customizr/inc/assets/js/bootstrap.min.js
wp-content/themes/customizr/inc/assets/js/holder.js
wp-content/themes/customizr/inc/assets/js/modernizr.js
wp-content/themes/customizr/inc/assets/js/modernizr.min.js
wp-content/themes/customizr/inc/assets/js/retina.js
wp-content/themes/customizr/inc/assets/js/retina.min.js
wp-content/themes/customizr/inc/assets/js/tc-scripts.js
wp-content/themes/customizr/inc/assets/js/tc-scripts.min.js
wp-content/themes/customizr/inc/assets/js/fancybox/jquery.easing-1.3.pack.js
wp-content/themes/customizr/inc/assets/js/fancybox/jquery.fancybox-1.3.4.js
wp-content/themes/customizr/inc/assets/js/fancybox/jquery.fancybox-1.3.4.min.js
wp-content/themes/customizr/inc/assets/js/fancybox/jquery.fancybox-1.3.4.pack.js
wp-content/themes/customizr/inc/assets/js/fancybox/jquery.mousewheel-3.0.4.pack.js
Once I purged those files on CloudFlare the sites worked perfectly!
Hope this helps some of you.
Thank you,
Sarah