I go to a Wordpress blog where, an hour ago, I was developing a post. I had a total of 14 draft posts under development there. Opera (recent or latest version, installed on Windows 7) has reliably shown me that list of drafts, but this week I am trying Opera Portable 47.0 x64 on a new (Windows 10) installation (same hardware). This version of Opera reported that it was unable to save my last draft, so I killed and restarted it. Now it says, "You don't have any drafts. Would you like to create one?"
Opening the same blog in Firefox confirms that the drafts are still there. It seems I can't display an image here, but the little pencil-and-paper icon at the top of the screen in Opera does have the number 14 next to it, and when I mouse over it, the tooltip confirms that this is the number of "Latest Drafts." When I click on the 14, I get "See all drafts (14)," and when I choose that, I'm back to this "You don't have any drafts" page.