Unity 4 animations

hi . i installed unity 3d 4 but i have a problem . Last week i have a unity 4 b5 and animation worked correctly but now it isnt working .
what is the problem ? Thanks

there are times in wich all of the sudden the controller for state machines stop working correctly, in my case i just restart unity and it works. currently i’m using unity 4.0.f7. you might want to update yours. i barely see that happening now

İt didnt work and im using unity 4.0.f7 too