Me-My had brought it to my attention about the chat timing out, I did a look on the support forums for forumotion for Admins and there is a bug in the forum software that was not resolved by the previous update.
It should be when the next update comes from the tech support group, however there is not a time as to when it will be implemented.
Subject: Chat Notice 
Sun Jan 18, 2009 12:27 pm