#Uncertainty Principle
In the new world of scripts you may encounter a variation of
Heisenberg's Uncertainty Principle.
It all starts when you use a few script commands to slide the keys
for an object. No problem, that works fine. Later, however, if you
use the Key Info Dialog Box to change a few values, and to check
others, the results may be unexpected. And, undoing the changes, does
not restore the animation.
What happened? One of your keys slid into a negative time. You checked
its value. Even though you didn't change it, 3ds thinks you just
entered an illegal time (how else could it have gotten there?!), and
fixes it for you.