The error is in the original Bioware script that determines immunity to mind spells. The hard coded saving throw script returns type 2 (mind immunity) for blindness on a character with clarity, but Bioware's MySavingThrow function changes it to type 0 (failure). Since it's supposed to be an immunity, the module doesn't even bother to roll a saving throw. Failure is automatic.
I hope to find and fix these problems in the next update.