When you are creating a new post or replying to an old one, 3 buttons are supposed to appear at the bottom of the writing box. The choices are "Post", "Preview", and "Cancel".
On my iPad, these buttons show up properly.
On my laptop (Windows 7, IE 😎 the buttons used to have only their top halves visible. Today they have disappeared completely. I can tell they are still there because my cursor changes from a pointer to a pointing hand when I move over the area where the buttons should be - but I have to guess which one I'm clicking! What's up?