I'm betting "Link display format"
It's the new user preference. I'll bet [link|/forums/render/user?username=deSitter|deSitter] has it set for numeric.
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Microsoft offers them the one thing most business people will pay any price for - the ability to say "we had no choice - everyone's doing it that way." -- [link|http://z.iwethey.org/forums/render/content/show?contentid=38978|Andrew Grygus]