I have four or five guys testing the forums, but only one cannot post in the chat and shoutbox. I'm not sure whether it's a problem on his side, or a problem on the side of the Mod/Forum.
His permissions are set to Full Admin, the same as mine. I tried adding him to a member group (the same group as the other testers), but this didn't work either. He's tried updating his Java, installed IE7, but it's still happening.