When a script that used setAttr for Camera Data objs (the bug also affected some other modules) was executed multiple times, Blender would crash after, let's say, the first 5 or 6 tries. Problem, as Guignot pointed, was with reference counting. Should be ok now, all affected modules were fixed. * The Scene module is now "complete" (= 2.25). * Made some necessary updates to Object and NMesh.