using Unity 4.3
http://www.youtube.com/watch?v=78CKcW3mP04I made a little video of what has happened. Not all my animations have stopped just one set in paticular. I am not sure what I should do to make them work again...
you will see in the sprite animation timeline they are all present but when the animation is in the player nothing happens...
edit:
Just found another posting about v2.3.3
line 633 of tk2dSpriteAnimator needs
int currFrame = (currentClip.frames.Length > 1) ? ((int)clipTime % (currentClip.frames.Length + currentClip.frames.Length - 2)) : 0;
for the pingpong to work correctly. sweet all is good now.