Except for the double-quote, this has happened to me as well.
Also, the time it takes to post, whether it's a new reply or an edit to a previous post, varies greatly--sometimes it takes only a moment, other times it takes up to 20-30 seconds.
Another intermittent problem occurs when I click on "Post Reply" or "Save Changes"; my browser freezes, and when I try to click on either function a second time I get an error message that states, "therpf.com is not responding" and I have to reload the page.
BTW, those all happened while browsing using Internet Explorer 9. I'm currently using Mozilla Firefox 20.0.1 and none of the above have happened yet; we'll see what happens when I try to post this.