I have enabled the new 'Like' button for my posts. When I view the post (both as a registered user and as a anonymous user) the button appears greyed out with the text 'Loading...' next to it.
Firebug code reports the following:
<div id="like-post-wrapper-6633141-1071" class="sharedaddy sd-block sd-like jetpack-likes-widget-wrapper jetpack-likes-widget-unloaded" data-name="like-post-frame-6633141-1071" data-src="http://widgets.wp.com/likes/#blog_id=6633141&post_id=1071&origin=http://tfindley.co.uk"> <h3 class="sd-title">Like this:</h3> <div class="post-likes-widget-placeholder" style="height:55px"> <span class="button"> <span>Like</span> </span> <span class="loading">Loading...</span> </div> <span class="sd-text-color"></span> <a class="sd-link-color"></a> </div> </div>
I can replicate this using Firefox and Chrome.
WordPress has W3 Total Cache (with Amazon CDN) enabled, and Bulletproof Security.