Got a bug to report. I never noticed it on my board. But installed a chatbox on friends board which is not English but in Ex-Yugoslavian languages like Croatian,Bosnian etc.
And this happens when someone tries to use a special character letters from that language like:
A shout containing those letters is not displayed. Nor error received. But afterwards messages that don't contain them can't be posted either by that member, they get an error:
"error: please wait some seconds before sending a new message".
After that logging out seems to help to loose that error.