When this option is checked, any changes made with the Subdivides menu or the Appearances menu will automatically initiate a render operation.  As you first work with Fractal!, having this feature enabled is a good idea.  This way you can see the effects of each change as you make it.  While Auto Render can be very convenient, once you are familiar with all of the programs features it will probably be preferable to make many changes before initiating a new render.

This parameter is saved with the parameter file.