It's all over the EAxis forums ever since SN. *shrugs*
It's just that I didn't play any of the Ambitions careers since Supernatural, and I would assume this to be the case for a bunch of people, so it's easy to not run into that bug for months.
I can't think of a single mod that would prevent those ghosts from being created by the game (plus, I think many of the kids posting on the EAxis forums don't even know how to use mods, so....) but I'm going to start a fresh, unmodded game just to be 100% certain.