Leaving a comment to second that it seems to still be broken, at least with MCCC; specifically I'm getting a last exception with career_interactions.py on the _update function. Error message: Exception thrown while calling remove on (TypeError: 'ImmutableSlots' object is not callable), CategoryID: career_interactions:730.
Edit to say that I was so caught up with making sure that I got the error message that I forgot to say thank you for the mod!! Zero pressure, just wanted to provide more data on what it was complaining about.