OK, the mystery is over.
Since the area between the Coliseum and Schwabinchen is, well, ugly to look at, they decided they were going to put a fence in there. They ran out of time before the season started and didn't complete it.
Rare form for Cedar Point to miss opening day like that, but they obviously had bigger things to worry about!
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Jeff
Webmaster/Guide to The Point
Millennium Force laps: 35