You see, I have this character here, and occassinally I run into phenomenon I can't really understand:
http://img338.imageshack.us/img338/3059/captureled.png
I have the guys animations stored in all sorts of Actions. When I do some modifications for an Action (switching the hand to 'closed' etc) sometimes it affects other Actions aswell and the hand gets corrupted, there is no way to bring it back. THe only thing that shows is that small red square, that's all what's left of it.

I'm sure, that's something everyone bumped into, so what is causing this? I really don't have a clue, please help!
Tried to search the forums for this, no luck yet.