I was just in Houston, and the bartender at the local Pappadeux's was an ACE'r, model coaster builder, IAAPA convention goer and former Astroworld employee. He says that "the coaster formerly known as Thriller" has problems due mostly to the East Texas heat. It causes the track to expand, causing the trains to travel too slowly to make it through the course.
I don't know if that is the reason or not, but he was convinced it was weather related.
Either way, it was closed on my one and only day at SFAW, I was really looking foreward to Anton's masterpiece. Oh well.
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"X" marks the spot in 2001!