We call this "demo effect" at work when everything works OK until you show it to someone - then it goes pear-shaped for some reason nobody can explain. And of course it returns to its normal behauvuour later...
Strangely, I WAS trying to prepare a demo release for a few people last night. :)
I'm still boggled as to what happened. I think the compiler got a burr up it's ass for whatever reason. All I know is that it's happy now. Weird!