Hi stevenpalmer ,
Thanks for the link.
I took a look at your site and it seems that an older Facebok sdk is being loaded in and overwriting the one that Buttonizer is trying to load in.
The sdk that Buttonizer tries to load in includes the Facebook Messenger Widget's code and everything this older sdk has, so you only need to load in Buttonizer's.
Do you perhaps know if this was manually added into your site or if a plugin has any Facebook functionalities that would try to load in this sdk?