creature corpse forever? (in Ludmilla)

When I killed a creature, the corpse never disappeared! (Maybe it would disappear in 10 or 20 hours maybe.)

I can decrease the spawn-time in the creature_class.py file. As a result, when I trained a pet, using a hunter char, the creature was re-spawned immediately because no corpse was left. However, if the creature is killed, its corpse never disappears, so it can never be re-spawned. After a while, there are corpses every where, and nothing you can kill.

Did some one meet the some problem? Or how can I change the time for the corpses?