Digital Light & Color

When using a custom brush, the last setting restore the custom brush symbol selected ( button labeled with icon C ). However, the custom brush shape display remains solid white. Furthermore, the radius slider seems ineffective.

Restore last settings does not restore the auxiliary inputs which is where the custom brush shape is stored. This is in general not possible to restore just from the settings of the current transformation since the custom brush shape image may be computed based on a any number of other images and transformations. If you want to save and restore cloning with a custom brush you need to use a script instead so all the images it depends on can be saved and restored.