Hi, the backspace behavior is fixed in 1.1.3 beta 2, which is great, but there are still problems with listings. Try inserting many listings in a row. The 8th and subsequent listings can be edited, but do not show up in the main text view.
Also, as a sidenote it would be very handy to have a formatting option for inline code blocks - e.g. when mentioning a short unix command in documentation or notes.