Error 400 when trying to publish to wordpress

#1

I used to publish to wordpress in the past, it worked like a charm.
I had been without doing it for a while, now today I get that error.
What could cause that?

Thank you.

#2

I am also experiencing this issue, it doesn’t seem to happen on all of my documents however I would say that out of 12 documents I am only able to actually publish 3 of them to Wordpress, I am able to publish all of them to Gist though.