This won't solve ones already posted, but it will block future ones. Just do it to each template and voila! Find in your respective postbit template:

[PHP]<if condition="$post['signature']">[/PHP]

Replace with:

[PHP]<if condition="$post['signature'] AND $GLOBALS[forumid] != X">[/PHP]

Replace X with the Forum ID of the Forum you don't want Signatures displayed in.

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As for other matters, I am swamped. 5 Classes is a pain. More on that subject later... as it is time for class.