Reported by a user of my site and I've verified it myself.
The verbatim block is large, and, incidently, carries a text represnetation of a PGP key.
For some reason the verbatim isn't getting added back in. Investigating -
CC
verbatim blocks were not visible in preview because verbatim blocks were being lifted out of the text before rendering. The first thing the rendering function does is to remove all occurences of the \0 character, which is what is used as a marker for verbatim blocks. The rendering takes care of verbatim blocks itself; it should never be necessary for the caller to remove them.
SVN 4423
CC