Shows some times and not on all posts... Sporadic functionality

Floating Social is something I definitely want to add to my non-profit organization's website but I'm running into a few issues here:

1. It seems to only appear on certain occassional blog posts

2. Sometimes (like now) it doesn't show at all. When a few refreshes ago it was showing.

This is a sample post it should appear on:
http://www.thewahlsfoundation.com/dr-wahls-gives-tedx-talk-on-overcoming-multiple-sclerosis/

At the time of this writing, it isn't appearing anywhere, although it's activated and was running a few minutes ago - I didn't even change anything and it doesn't run.

Help please. Thanks!

Edit:
It started to work on some pages, and now not on some others.

Here is a classic example, the following page it appeared to work, but then I navigated away and then back and it's gone:

http://www.thewahlsfoundation.com/epigenetics-how-your-environment-affects-your-genes/