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Like you don't want one at all anymore, or you want to change it? It's control in the Control Panel... but I'm sure you know that since you've got the avatar posted.
Hmmmm your, right, I can't get it blank either. I will get on this and get back to you, if there's not a way to erase it, we will likely add a 'No Avatar' option... Sorry about this... I'll talk to Ralph (the owner) and get back to you...