Mary calls for a "Open Lock" check in order for you to rid her of her shackles. Combat log, however, reads "Bluff - " This may be so because some characters simply don't PP.

Other NPCs whom you may "[persuade]" to give you something extra, however, also force you to roll a [Bluff] Check instead. I know this is the case for the Cleric-Spellguard delivery quest; and right now I doubt it's only concerning these two. (You need Bluff instead of Persuade, or so would seem to be the case)

I got Bluff for my evil character, and persuade for my good character, but my good character was about a month back, so i could be wrong.

I suspect that I may have inadvertantly introduced a minor bug into the skill check scripts with one of my fixes yesterday. Should be easy to take care of. Until then, those of you with high Bluff checks enjoy it while it lasts! >_>

Fixed in v789.