These are brief messages, and they do not provide a direct way to visualize the rays that generate the error conditions. Ray paths can help diagnose these types of issues. We will use a simple model to illustrate basic concepts in the next section. More practical examples are described in the full presentation (link provided at the end).
Model Positioning Error
Consider the simple model shown below. Two blocks are placed next to each other with a small air gap. Because of a modeling error, the second block is tilted slightly backward. This small error in the model produces errors during the simulation. Note that the message indicates that surfaces Cube_2.TopSurface and Cube_2.RightSurface are possibly overlapping with other geometry.
However, preview rays do not indicate any obvious issue. With the default settings, preview rays show the first 100 rays in a simulation, and those rays may not necessarily encounter overlapped area of the model.