The boil off system might have been part of the issue. Friday night as I was walking the pits in the dark I overheard part of a converstation between Mr Cornell and Steve H. Jr. It sounded like there might be an issue with getting an air bubble somewhere in the boiloff system that causes issues. It sounds like the reason is because the tank sits at an angle and if the water sloshes it traps air or something. I'm not 100% sure they were talking about the boiloff system or not, but it sounded like it.

Mr Cornell also had an interesting story about riding around in Jay Leno's tank car and loosing an oil line somewhere in L.A. Apparently it made quite a mess.