See »Are you safe from Mixed Content attacks? for an example. I entered the same code twice, but with additional line breaks in the second instance. I am seeing the first instance as truncated and with a "?" inserted.
there were two issues, one with the green [?] pop-up appearing over text the other was that the horizontal screen was not added if the code block is only one (long) line for some reason that I couldn't figure out. So I add a blank line to the end, and put a display:none on the [?] box.