This is a common issue if you are also using Cloudflare.

The issue with Layerslider is due to how Cloudflare is changing your site output.


See here


http://codecanyon.net/item/layerslider-responsive-wordpress-slider-plugin-/1362246/comments?filter=all&site=codecanyon.net&term=cloudflare&utf8=%E2%9C%93#comment_8189854


Try disabling any form of minification/caching in Cloudflare including Rocketscript and see if that resolves the issue.


You'll also need to flush any cloudflare caches and try in a clean browser session.