When importing .X models, it seems that the last frame of the animations isn't being imported correctly into MED.
I have tried several modelers that export to .X and the results are the same.
You can download the .X model below, import it into MED, and compare the last frame in MED with that frame in any other .X viewer.
What is happening is that, instead of importing the correct frame data, the last frame of every scene is being copied from the first frame of the scene. This happens for every scene in the model.
I am using 6.40 but If I remember right this little problem is present since 6.31 or before.
http://www.moscafilms.com.br/emilioleroux/temp/badlast.zip|Emilio|