The problem was that index.php?action=forum&board=some_id ends up using action=forum to go to the front page of the forum [it is a TinyPortal variable and not default SMF] and I thought it would smart enough to evaluate board=some_id to go to a specific board. Oh well, I just removed the action=forum [I thought it was telling TP that it was in forum mode, turns out it just takes you to the forum page].