“Something went wrong and we can’t sign you in right now” when I try to upload a movie to Facebook

Split from this thread.

I have had the exact same issue--I spend lots of time *making* my movie but when I attempt to publish it I get the following error message:  "Something went wrong and we can't sign you in right now. Please try again later."

I have been trying for three days.  I have rebooted my computer. I know all of my passwords and have tried while logged in and not logged in to FaceBook and Live.com and every combination. 

What do I need to do to resolve this issue?