It may or may not be peculiar to my system, but other people are reporting something which sounds the same. Amhazair for example in a couple of threads on the mod forum, he also mentions Lolomo was seeing the same bug.
http://www.shrapnelcommunity.com/thr...=5&o=&fpart=13
And no, I'm not confused about #custommagic for the holy path. I'm aware that's never worked. I'm saying all of my mod nations have lost all magic paths on all recruitables, both those using the straightforward #magicskill and those using #custommagic. I haven't changed anything about any of them - this has occured purely with the patch being applied.
I just tested it now and things appeared to be working normally,.. at firzt,...
First I tried just Skaven - worked fine.
Then Skaven + Ogres - worked fine.
Skaven + Ogres + Avernum - fine.
Arga + Skaven + Ogres + Avernum - fine.
Arga + Skaven + Ogres + Avernum + CBM - fine.
But when loaded in this order,...
CBM
Skaven
Streamers and standards
arga dis
ogres
avernum
Then vanilla nation mages have magic, but none of the mod nation mages do. It therefore appears to be another overflow bug of some kind.