Sphere collider problem

Hi all,

i'm using Crystal 1.4 in Windows Vista and i have implemented my collision system similar to the appphystut, using iDynamicSystem and associating the camera to an iRigidBody with an sphere collider attached. Nowadays i only use 6 walls (boxes) in order to close my single sector and the sphere collider attached to the iRidigBody that i move together the camera. The size and the position of the sphere and different walls depends on the world i'm going to load (as bigger is the world, bigger is the radius of the sphere and the size of the boxes that form the walls). The problem appear when i load an smaller world than the actual (not at the opposite), i can't move well the camera because there is less space than it should be. I have been doing tests and i think that the walls and the sphere are well destroyed before create the nexts, and i have prove that the new sizes are ok, but now i dont know what more check. Any idea? Before load the next world i do:

avatarbody->DestroyColliders();
dynSys->DestroyColliders();
dynSys->RemoveBody(avatarbody);
engine->DeleteAll();

Thanks!