Animation runs instantly

Hello.
Have you, too, experienced, that an animation you built into the model does only show the first and last keyframe? i experienced it now using the header from sc_extend wings from the rh_elite model. is this problem known and is there a solution for it?

i suspect it could have something to do with the duration. other animations i looked into had their second keyframe at or after 1.0 seconds. another limitation?

edit: as we are on it: is there a way to force all types of equipment to render each frame on their actual position while an animation runs? e.g. weapons or runninglights apper on the new position only after the animation is over.