I'm having this problem as well. I've tried the approach suggested by Suen, but it unfortunately doesn't seem to work. I've also tried manually adding Hiravias to the party using console commands: this results in a lvl 1 clone appearing, but party management still doesn't work (ends up with two Hiravias in the recruit screen, and still can't add/delete characters).
This is completely game breaking for me, and I can only hope an upcoming patch is able to fix games broken by it, as otherwise I doubt I'll play this any further. Does anyone know if installing the White March would work to fix the problem?
