Softimage Xsi: Shaders + particles bug

Hello all


I've got a scene with particles with bubbles sprites on its, and the Toon_ink shader on the camera. When the particles is not visible (because the particles begin to simulate to another frame)

the render it's rigth:) , but when mental ray (3, I used XSI 2.01)must calculate the Toon_Ink shader and the particles, the Toon_Ink shader became a strange box wireframe.:annoyed:


Someone have my same problem?


Thanks in advise to all