These are images I just put in my Album here today. I'm fairly sure I'd have no problem posting one here in this message window:
But when I try to put that same photo into the Group, I get the broken-image icon, and in fact it looks as if all photos posted in groups by anyone are showing up with that icon.
I wonder if all Groups have been deactivated?
P.S. I tried using the BB code/IMG code too as you suggested but had the same result.