Maybe it's the designed behavior, but public_ubb_code_page.pl uses ™ and not $trade.

ie.
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UBBCode™ is a variation on the HTML tags you may already be familiar with.
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UBBCode™ is enabled in a forum, you no longer need to use the
[This message was edited by Charles Capps on November 05, 2002 at 10:50 AM.]