I can't post a reply from my Mac anymore. Whatever I try there's always the same error:
Your post has been changed because invalid HTML was found in the message body. The invalid HTML has been removed. Please review the message and submit the message when you are satisfied.
I assume it's due to Mac/Unix vs. Windows linebreaks which used to buggy all the time :-)
I'll get the developers on this immediately. Would you please private message me your system type and OS configuration.