I no longer see my emblem, other player's emblem, or my emblem editor. I've never had an emblem that was inappropriate. It's just an "M". What gives?
Liar. It is clearly rated "M" for mature and the mass of kiddies that play CoD took offense
Go to options and check that you have "Emblems and Theater" enabled. That's the only thing that I can think that could cause the behaviour you described.