I also have the same problem. I can not post solution through your debugger page, because when I click on the link nothing happens (I can not write my problem – there is no form to write to).
XMLRPC file is OK!
click here to contact Jetpack support. – Link does not work in JetPack
My ticket number (#1774036):
at the end I disabled publicize plugin inside jetpack and WP Super Cache started to work properly.