Hi JacopoGrosso,
I had the same issue with that too! If you render 100 frames you just get 100 frames of frame no.1!
I used a script i downloaded i don't recall the name but here is the script....
The script renders each individual frame, works for me!
...Hope it helps you.
........
I created a txt document (notepad), saved, changed extension from .txt to .ms
After in 3Ds..I imported all (animation and meshes .bin) and saw the same problem..tried to run the script but every frame I had to press OK on the tab that was appearing, saying "error creating file output", so I pressed 100 times OK ahahah
What I'm doing wrong? :(
EDIT: Ok now it works, I set the animation and the save folder and it starts rendering every frame, thank you very much :)
MY PASS:
1) set frames, folder where 3ds saves
2) run script
3) done