Taken from our Help& FAQs page:
0.5) My message will not post, after pressing the post message button I just see my message again
Yes, this is weird one and we're working on it. If you message has the words special-ised, special-ist, special-ism in it (without the hyphens) then it gets rejected so please replace that word with something else, perhaps expert or expertise.
let me know if you still can't post after that
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