Mec Anim `Loop Pose` clips fbx animation

Status:

Exported a very simple animation on a BIPED with extra Bones from 3ds max (2012). Playing the Animation in the preview works fine (with all the feature as it should be).

When I use the Checkbox 'LOOP POSE', the clip is looped, but the Animation is dimmed down and looped within the original range. So when I would sketch it like this:

Time: 0 --------> 1

Animation%: 0 --------> 1

Loop Pose Checked:

Time: 0 ----------> 1

Animation%: 0 --->0.1---> 0

If the Time 0 is start of animation and 1 is the endframe. And Animation % is the Motion of a Bone. So said differently, the Arms do only rise 10% and are going back down to origin within the given Time instead of going up just only once but 100%.

The correct Loop should be rise up to 100% at time 1, jump back to 0% at time 0.

Any ideas?

Cheers Werner