Maybe it doesn't like the penalty... or something else on the character already gives a Listen competence bonus. I can't find an item in d20 to use as a reference - if you can think of any item that applies a penalty, try looking at how that's coded.
Current RPG's: Pathfinder (GM), Pathfinder (Player), Gamma World (GM, Pathfinder homebrew).
HeroLab: 3.5 & Pathfinder. HL User Files for PF: Greyhawk Setting, Gamma World (WIP).
DM and player of D&D since 1980.
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