I'm the plugin author.
I've seen two reports on twitter of disappearing text related to the wp-Typography plugin with version 1.21.1 and wp version 2.9.2. The posters have not responded with information that has allowed me to recreate the issue. I do not know if it is a theme deficiency, or a plugin bug.
Is anyone else having this issue? If so, can you tip me off on how to recreate it? If there is a bug in the plugin, I'd like to fix it.