The pale justice is most likely bug in unfinished business mod. I think that mod does some changes for that. Reinstalling the game now and will leave out ufb and item upgrade this time.
Marketh could be ufb issue also (or bg2 engine like Berelinde said)
Orc cave crash I couldn't reproduce myself either, so don't think it's anything but weird random crash.
Bhaalspawn powers. Start new game, import char for the leader spot and you gain them. Don't think that's how I gained them in the 1st walkthrough, but that seems to always give them.