We have heard of some issues regarding the LiveEditor not working properly or not loading when the LayerSlider plugin is installed and active:
The plugin in question is:
LayerSlider Responsive WordPress Slider Plugin: http://codecanyon.net/item/layerslider-responsive-wordpress-slider-plugin-/1362246
Recommended Solution
Go to OptimizePress >> click Support >> go to Disable Script and Style >> go to Plugins at the right hand side >> disable both the frontend and backend CSS of the cuplrit plugin by ticking the box >> save when done.
That should fix the issue.