That’s just the authentication process, which seems to time out without a new page load for several minutes. Clicking save doesn’t kick authentication.win into action, but refreshing or loading any page will. Doing so, just like Evspra says, will allow you to click back to your still-in-limbo post, and hit save again. No need to copy/paste/refresh the page you were typing on. Ever since I figured this out, I’ve never lost anything, and don’t even find it to be much of a bother.