The play() function

I’ve got a very basic fla file which actually worked on flash5 but it’s no more working with flashmx 2004…
A movie clip move from a position , let say A, to B, then to C.

I insert a stop(); action on B, so the movie stop. Inside the movie entitie I insert a button with the command play() (I have also try _level0.play() or nameofmovie.play()).
I expected that the movie continue playing from B to C but it does nothing…

Here is the fla file…
someone can help me…
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Flash5 and Flash mx aren’t using the same version of actionscript if im not mistaken. So a lot of actionscripting that worked in flash5 wont work in Mx…
Correct me if im wrong