Once the fractures are generated, you will have access to the Details module. In it, you can choose to accept your fractures as they are, without adding details. 

You can also choose the "Add Extra Details" option to generate internal details in your fractures. This module contains a lot of tools that we will see below.

The tools in the Fixing section are very important and useful.

Depending on the complexity of the geometry, noise size, subdivisions, etc... some chunks will often generate errors when adding Extra details. We can easily fix them with the tools in the Fixing section.

First we can do a manual "Pre-selection" (using the C key) of the chunks that are "broken". It is not necessary to select only those chunks, they can be selected quickly with the C key. Once selected, click on "Select Bad Chunks" and RBDLab will automatically select the broken chunks within that "Pre selection". Then simply click on "Auto Fix" and they will be repaired.

We can deselect the "In PreSelection" tab and use Select Bad Chunks without making any pre-selection, but it will be much slower.