It's actually a bug with the fourm itself. when I look at the bonfire board, this is the URL:
http://texags.com/main/forum.topic.asp?forum_id=14&Days=356
notice that bit at the end, where it says "Days=356"? That's because I have it set to show all topics from the last year. if you have it set to show all topics from today, it'll say Days=1; you get the idea. The problem is, "Show all Topics" sets the variable to 1000, which, if you do the math, is sometime in 2006. Unless they go in and change the source (I'm not holding my breath), the only way to show older topics is going to be to manually change it (as commando2004 seems to have done).