wildfire config.pro option documentation for:            

accuracy_lower_bound

<value> (between 1.0e-6 and 1.0e-4)

enter an accuracy value to override the default lower limit of 0.0001. the upper limit is fixed at 0.01.

when working in moldesign or casting, it is recommended that you set this option to a very small number, such as 0.0000001.