SetUnitAnimationByIndex problems?

Hello,
I noticed that sometimes the jass animation function SetUnitAnimationByIndex somehow does not seem to work, it just does not play any animation at all. When I try to run war3 once more, maybe it works again.
Do you know this problem?
Is there any way to kill the problem relieable or any special event when it happens? I think it occurse especially if you run war3 often in the same uptime, e.g. to test a cinematic.

Thanks for your answers,
Waldbaer

Never heard of it before.
Are you sure your putting a fixed working number as the index? Things like GetRandomInt(1, 100) in it will not always work.

I have never seen it fail

So far as I know the only thing that will screw it up is issuing an order to the unit, since it will reset the unit's animation. But that is to be expected.

Hm. Ok, you don't know it. The weird thing is that it only happens sometimes, when I run war3 very often, e.g. to test a cinematic scene. But there is no regularity. Maybe this is also a mac-only problem; I think I did not see it on my PC until now... by the way, it can be fixed by restarting the computer, then everything works fine again.
Confusing thing, seems to be a bug in war3.