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I always save my KeyFrame bars, the thin grey bar with the pluses that always travels to whichever layer you happen to be sitting on. Those are the keys that disappear on you, but if you saved them by exporting them through the FXBin button at the top right, you can at any point retrieve your Keys. Sometimes I'll save several of these if I can't make up my mind on the spot which move I like best.

painterX wrote:... but can you answer me to my question(maybe i dont do it right). When i click on Reset or UNDO in the FX stack, why only the keys go away but the movement in the layer stays.(i mean, neverthless the character goes from A to B)

Elodie already answered this question : we have 2 different "Undo", one in the FX-stack (use this one to undo the last modification you've made in the FX settings), the other one (in the main panel), will undo the last modification made in the prolect itself,
short-keys being respectively and ShiFt .

painterX wrote:... When i click on Reset or UNDO in the FX stack, why only the keys go away but the movement in the layer stays.(i mean, neverthless the character goes from A to B)

if you want to undo what you have applied in the project, just use the other Undo, the main one, (not the one into the stack panel, dedicated to the FX's keys settings only).

hey,i am working now with the keyframer. but suddenly are all the keys away, that i cannot change the movement. i think, that was at the moment, i have take an new effect on a different layer.is this normal? because it is very difficult, always start from the beginnig, when i dont like the movement i have done.