I have just bought the Michael Post PMI HolyGrail add on for Kontakt2

It works fine on most pianos I have, but on others, it causes Sustain pedal to cut the notes, rather than sustain.

PMI Old Lady and Bosendorfer290 are the pianos I'm having this problem with.
I have compared piano settings that work, with those that don't, and not seen anything obvious.

Has anyone had this problem and solved it?

I have searched this forum, and while there are subject on sustain, none on this one.