I just played with the "Your signature" textarea in my User Settings, and experienced the behavior you describe. I wrote in some text using square brackets and code tags, and after submitting the contents of the textarea had been munged. This looks like a bug.

This workaround won't help if you really want the effect of code tags, but you can replace the square brackets with [ and ]. That seems to work:

[chipmunk]

In reply to Re: Signature box interpolation problem by chipmunk
in thread Signature box interpolation problem by jlongino

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
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