I was swapping out some of the emotes in the Personal Emote set, and somehow ended up with two of the slots effectively locked out. Both slots are named *UnknownEmote, and any attempt to remove them results in a target emote not found error message.
As for what caused it, I simply do not know.
Of course, I would like all five slots open for use.
ok, I guess something is really broken with that set then. I'll see which dev can help you here