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IE6 was blocking my cookie created by my phpbb message board software. I don't quite understand why it was blocking the cookie but I found a solution over at the phpbb forums.
I had to add this line to a file,
header('P3P: CP="NOI ADM DEV PSAi COM NAV OUR OTRo STP IND DEM"'); Either way, it works now. I'll have to figure out what all that means later.