It tells to 'please enter a message' although I am certain I don't imagine the text I've just written.
For now, copy your text, refresh the page, paste it back into the box and it should work then.
Safari is not officially supported. If it works, count yoru blessings. If if doesn't, try IE7 or FF3.
Looks like their using TinyMCE for their WYSIWYG. It has trouble loading sometimes with Google Chrome and Safari. You need to make sure you see the buttons above the text box before trying to post a message.
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