Ever since I updated your plugin to 5.55, I can no longer post on my own shoutbox.
I always encounter this message, "No, sorry you used the name of a registered user! You have to change it please."
And even with the implementation of Captcha (I had this disabled before), I still get numerous spam messages on my shoutbox. So everyday it is becoming a chore for me to delete / ban these spam messages via the Live Shoutbox admin panel.
In case you want to see my blog, you can visit it at http://cashquest.info.
Hoping for your speedy reply.