The passive softening option in the analysis method dialog box appears to be locked and cannot be accessed.

To use the passive softening feature, there must be undrained material at the current excavated level.  Once this is the case, the option will become available.  You then set the level of the softening surface.  The undrained strength of the material will vary from zero at ground level to the specified "global softening" percentage at the softening surface, then continue at that percentage below.  

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