Large buttons don't display at all. Medium size buttons do show, however it prevents posts summaries from displaying on the main and index pages and messed up the featured post slider with messed up titles and multiple image overlays. I took care to disable AddThis via the check box option on my static home page. I am running Yoast SEO which is noted in the Support forum to cause problems for AddThis.
Individual post pages displayed fine with the AddThis medium buttons.
Uninstalled the plugin and everything is back to normal. I was hoping after trying other plugins that either slowed down my site or included questionable backend services that AddThis was the solution. Will wait for a new version and try again.