From what I have noticed the slow or stuck chat is caused by an individuals bandwidth. What I mean is this the refresh of chat will not occur if the person is doing downloading of any kind and sometimes if they are uploading. It seems the chatbox times itself out and never truly populates if it reaches a certain ammount of time. Anyone not using a lot of their bandwidth doing other things never experiences the chatbox not refreshing or getting stuck.
Side Note : If you get the chatbox coming up but blank its usually because an ascii character was inserted on someones chat msg, most commonly with PS3 users. Just go into archive and delete that bad chat or edit and remove the bad character which will be obvious when you look in the archive.
Hope This Helps Some of You!
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