Ok, the problem is.. since im using bones animation. (and i want the bones to be exported as well something wrong happens.
here is a pic.
As you can see, i have my model facing downwards and i enter bones mode so you can see the bones in the model.
I proced to rotate him in med 90degrees. Then i enter bones mode again.. And the bones are in the orginal place. They havent rotated with the model. ok.. When i enter in animation mode. You can clearly see that the model loses integeity. Becomes all distorted.
In the last pic. i tried rotatin the bones 90 degress as well but the results are equal. the animations loses integrity.