title: Sliders not showing up: setREVStartSize is not defined
body: <p>After I upgrade my Revolution slider plugin (5.4.5.1) for Wordpress (4.8) I start to get this error: setREVStartSize is not defined</p>
  
  <p>I'm trying differents approaches to fix this but without success. Is this a specific js file to be loaded in order to fix this? I don't if my theme is loading all assets.</p>
  
  <p>Thanks!</p>