What Tiramon described was also what happened to me up to yesterday (I can't tell for today as I haven't used the chat today).
Whenever the chat refreshes,
* The randomized nicknames for some users (me and/or others) are shown instead of the user names.
* The randomized nicknames may or may not refresh to the user names after some time.
Another issue with the refresh which occurred a few times to me: I was typing a reply to a post in the forum, but when the chat refreshed, the cursor jumped to the chat window. So when I continued to type (not realising that the cursor had jumped), the words started to appear in the chat typing area instead of the forum typing area. (One workaround that seems to work is to collapse the chat when I'm typing in the forum typing area, but that's not ideal.)