Firstly, I would like to join wormbook in saying thank you, Sudrien
Secondly, I was not here this morning so I don't exactly know what happened (referring to the problems described in Kugayama's and Black Sword's recent posts). However, I was here when wormbook was doing the aforementioned tests and helped her out with them a bit at some point. This is a summary of the things we noted (just in case anything was missed in her post):
1. Firefox users cannot see any text apart from joins/leaves/name changes. However, they are able to see their own messages in PMs, but not the message of the person they are PMing.
2. IE users can see all messages, but they still cannot see coloured text.
3. The /join command works on both browsers, but the /invite command is 'invalid'. Also, no one else can join a room you created on Firefox or IE.
4. When joining a private room in either browser, one automatically becomes the moderator of that room but their name is changed back to the kajiuran name they entered the main room as (e.g. I joined the room as kajiuran1374, changed my nickname to 9999, but my name was changed back to kajiuran1374 when I joined a new room). The name change only happens in the new room.
5. A new icon appears in the gap between the 'Display Status Messages' icon and the 'Room Occupants' icon when you join a private room: the 'Room Administration' icon. When you click on it, you get a 'Change Subject' option. However, this option only appears in Firefox. It did not appear on IE, and at first the icon itself did not appear (it did a quite a while later).
6. Despite the 'Change Subject' option, you cannot actually change the subject.
7. One cannot see their own messages in a private room on Firefox, but they can in IE. This probably relates to the first point.
I believe those are all the points (for now at least). Hope this was of some help, and best of luck with the debugging
EDIT:
@wormbook22, you're welcome