Hi, its probably not enough number of ray bounces. Or something to do with nested dielectrics where you may control it using "Is Liquid" checkbox in the Transmission channel of material.
I recommend yo download new CentiLeo 0.66 which now supports Chinese Interface for node materials
It's getting more powerful. It's one of the fastest renderers I've ever used. The functionality is improving, but the effects are really, really good and the details are really cool. Thanks to developers
