Problem with Multi SceneManager

The game has 2 levels(A and B), and each level has its own Scenemanager, camera and some "PagedGeometry" of grass;
The "PagedGeometry" of grass of each level has its own material, texture and resource group;
When first finished creating level A, and then created level B, only the level A's grass were showed, and vice versa!
The ogre.log showed that the texture of level B's grass did not load, but material was parsed;

So, how to make the grass of the two levels show normally ?

Thanks !