Another interesting twist, I'm at my office now and the Facebook integration works on Firefox and Safari but not Chrome. Earlier, at home I was on my Windows 8.1 laptop but in the office i have an iMac.
I'd be hard pressed to believe that this is a browser issue and not something in Xenforo that is causing the instability and now that I'm about to present it to our membership I have to preface everything with "this may or may not work but when it does it's great!"
Something of a buzzkill, no?