Problem with posting new thread

[antialiasis]

Okay, I'm still struggling with this default BBCode hack and it's in the very final stages - I got the BBCode itself working perfectly and the "Use default BBCode in this post" field is working too. However, it only works in replies, because when I try to submit a new thread, it gives me a database error about there not being a column called "usedefaultbbcode" in the thread table. However, it's not supposed to try to insert that into the thread table (it's just supposed to be in the first post of the thread), and I'm really not sure how that ever got in there. At least I've been searching in all the PHP files but can't seem to find where I can make it not do that. Just a quick newbie-ish question, basically: Why is it trying to insert it into that table and how do I stop it from trying it?