When a pc is morphed and dies, the corpse have the shape of the animal (and it's right) but the ghost is not a ghost!!
They see the world in colors, cannot pass through doors and cannot use anything ('cause they are dead)

Can someone explain me what usually happens when someone die ?
Thanks

You may want to put in your chrdeath.src to change the ghost's graphic to 402+ghost.gender

If a player is a ghost and is any graphic other than 402 or 403, they will still see the world in color. However, they are still DEAD, so POL still won't let them do things they aren't supposed to be doing.