Is there an issue with fixing things retroactively in people's save games? I guess it depends what is stored and how? If not just abilities, but also what bonuses the abilities provide are being stored numerically (instead of referencing the game files and adding appropriate multipliers etc) that could be an issue across the board. I just had to disable achievements for my current game because 1.05 doesn't retroactively fix GM's perception intellect switch. Had to fix it manually, no biggy, but I don't really get why a lot of these things can't be checked for when loading saves. Maybe if you manually remove the rangers marked prey ability and re-enable it with console, that will fix it?