Gallery inserts into post, but not visible on webpage

Hi,

Installed the plugin, created gallery, inserted into post. It looks like this in post edit field. It does not look like a slider, just 5 images: https://s28.postimg.org/jrp44u58d/wp_flexslider_in_post.png

After saving and viewing post, no slideshow. When I view source, I see slideshow code, here’s the start of the flex slider gallery code. (And yes, all the image urls work as well):
<div id='gallery-1' class='flexslider wp-flexslider gallery-flexslider' data-flex-settings='{&quot;animation&quot;:&quot;slide&quot;,&quot;slideshow&quot;:false,&quot;animationLoop&quot;:true,&quot;animationSpeed&quot;:600,&quot;slideshowSpeed&quot;:7000,&quot;directionNav&quot;:true,&quot;controlNav&quot;:true,&quot;smoothHeight&quot;:true}'><ul class='slides'><li><div class="flex-slide">

and flex slider JS code:

<link rel='stylesheet' id='flexslider-css'  href='https://mydomain.com/wp-content/plugins/wp-flexslider/assets/flexslider.css?ver=2.6.3' type='text/css' media='all' />
<link rel='stylesheet' id='wp-flexslider-css'  href='https://mydomain.com/wp-content/plugins/wp-flexslider/assets/css/style.css?ver=1.0' type='text/css' media='all' />
<script type='text/javascript' src='https://mydomain.com/wp-includes/js/admin-bar.min.js?ver=4.6.1'></script>
<script type='text/javascript' src='https://mydomain.com/wp-includes/js/wp-embed.min.js?ver=4.6.1'></script>
<script type='text/javascript' src='https://mydomain.com/wp-content/plugins/wp-flexslider/assets/jquery.flexslider.min.js?ver=2.6.3'></script>
<script type='text/javascript' src='https://mydomain.com/wp-includes/js/jquery/jquery.js?ver=1.12.4'></script>
<script type='text/javascript' src='https://mydomain.com/wp-includes/js/jquery/jquery-migrate.min.js?ver=1.4.1'></script>
<script type='text/javascript' src='https://mydomain.com/wp-content/plugins/wp-flexslider/assets/js/script.min.js?ver=1.0.0'></script>

Am I missing some JS so this shows up? Or something else?

Thanks in advance for your help,

Dean