I am having the exact same issue.
I have content in my website from a previous theme, none of it is editable and I can not create any new content on new pages either. I have also deactivated all of my plugins apart from VC and Ultimate VC, doesn’t fix the problem.
EDIT: Just realized this is in the Royal Forum, I’m having this issue with Woopress so I guess I’ll head over to that forum. Sorry! ~