It's total voodoo. Nothing you do REALLY makes any difference, other than it makes you feel better and randomly jogs the system. The reason this happens is due to some kind of race condition or multithreaded loading bug, and there is nothing you can do about it.
I think you must've said that a dozen times now. They just don't want to listen to you, do they, Pescado?
3booter works everytime a new build comes out. In fact, voodoo or not, I use 3booter whenever I install a new build... but Pescado's right, I bet I'm being superstitious.