Titles no longer showing

I use shadowbox and the shadowbox title plug in, but recently, the titles have stopped appearing in the modal. When I view source on the page, the title attribute has a value, but the title in the modal does not.

Example page

View source for an image that shows title attribute is there:
<a href="http://i1.wp.com/www.nadalnews.com/wp-content/uploads/2015/01/5b048dc2560d19006a0f6a706700953e.jpg" rel="shadowbox[sbpost-55106];player=img;" border="0"> <img data-attachment-id="55110" data-orig-file="http://www.nadalnews.com/wp-content/uploads/2015/01/5b048dc2560d19006a0f6a706700953e.jpg" data-orig-size="2552,1691" data-comments-opened="1" data-image-meta="{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}" data-image-title="Forehand" data-image-description="" data-medium-file="http://www.nadalnews.com/wp-content/uploads/2015/01/5b048dc2560d19006a0f6a706700953e-400x265.jpg" data-large-file="http://www.nadalnews.com/wp-content/uploads/2015/01/5b048dc2560d19006a0f6a706700953e-700x464.jpg" src="http://i1.wp.com/www.nadalnews.com/wp-content/uploads/2015/01/5b048dc2560d19006a0f6a706700953e.jpg?resize=359%2C238" data-original-width="359" data-original-height="238" title="Forehand" alt="" style="width: 328px; height: 217px;" data-recalc-dims="1"> </a>

View source of title element on modal that shows title empty:
<div id="sb-title"><div id="sb-title-inner" style="margin-top: 26px;"></div></div>

I just noticed this today, so I’m not sure when it started cropping. I did update WordPress to 4.1 not long ago

https://wordpress.org/plugins/shadowbox-js/