Keyframes In Maya - Anumation

I've got a problem.
Animating an object, when following its path, I can't set my keyframe.
I change frame, I place the object in the way I want and set the frame...and so forth.
When I come back with the cursore in the timeline the object doesn't change keeping the last modifications.

Keyframes seems not applied but they are marked on the timeline.

Any suggestion?

Cheers.
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QUOTE
Keyframes seems not applied but they are marked on the timeline.

Well you are keying but the worng thing. If its a object attached to path using Animate -> motion Paths -> Attach to motion path. Then you must use the set motion path key item in same menu (no not set key).

If its not about that then im afraid you need to explain a bit more