What sorts of things can cause a Sprite's animation to completely stop, besides calling "Pause animation"? I've got some characters running around in a particular project, and occasionally they completely lock up - no movement, no animation, etc. Other Sprites don't have this issue. This is a recent problem, and they have been working without issue up until now, and without any changes being made to the animations themselves, or even to the properties page of the Sprite.
Just not sure where to hunt for this bug. Thanks!