I haz a proof:
(http://www.ligh.de/PlaneShift/Vilenaut_shrinking.gif)
Bug #4215 (http://www.hydlaaplaza.com/flyspray/index.php?do=details&task_id=4215)
It is more or less related to the "Loader Cache", but mainly to flaws in the internals of CrystalSpace 3D and its animation system.