Removing HTML escapes from code

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Consider the following tiniest snippet of code

a < b

I typed this using a simple "less than" sign but on my http://askbot.com based AskBot, that less than sign is rendered as an < -i.e., it's been replaced by it's HTML escape code.

There clearly must be a way to avoid this - somewhere in the settings menus, as this doesn't happen on this site, but I can't seem to find it. Any advice?