I'm using WP 2.2.2 with cforms 5.4 and the Comment Quicktags-Reloaded 2.0 plugin.If I activate Comment Quicktags there will be also quicktags above the textarea of cforms. But If someone what to send me a message the content of the message is just the name of the first quicktag-button. You can type in what you want, it's always the same even with different browsers (IE 6, Safari 3.03, Firfox 2.0)
It seems that Comment Quicktags-Reloaded 2.0 is hi-jacking all text-areas on a given page. If that's the case, you may also want to get in touch with the author of the other plugin.
If you disable Ajax for the form, my guess is that it'll work. But that would just be a work around.