One can see this on the plugin update page:
Live Comment Preview
You have version 1.9 installed. Update to 2.0b1.
Compatibility with WordPress 3.2: Unknown
This is a beta release, has not been fully tested, and could cause problems. Do not upgrade if you're unsure what you're doing.
I just wanna let the plugin author know that he really shouldn't push beta releases to users because I'm pretty sure many have the tendency to just click update. I believe that only rock solid releases should go live.
Thanks for your plugin, I rely on it every day.