That is the exact error I get when the server I'm on rejects a keyword deemed dangerous, such as the word lynx (with a space after it). Perhaps your server has that same anti-hacking utility (or whatever it is) scanning your webforms, and it's rejecting a specific word being typed. Just a possibility. If you have them email the exact text to you, you could try it yourself to see if the server is rejecting something. You can also preview it here, as I don't think any utility like that is running (since I can use the work "lynx " here).
