Ho,

have tried to use the chat activity (for backup purposes) and here it's impossible to get it working (no matter of the type of chat I select):

• "Ajax chat room": Shows one "loading" div that never ends
• "(Use more accessible interface)": Shows one "horrible" (orange) div. Entering one message and submitting it leads to "There are no Chats in this course" error.
• "Click here to enter the chat now": Simply causes 100% blank page to be shown

This makes chat completely unusable...

Ciao

PS: Only tested with Safari