Ok, again sorry to revive the same dead thread...
BUT! I bring good news!
After some playing around, I managed to isolate the issue due to a file in the Override folder; don't know how I missed it all this time. Removing n_darkjedim001 from my Override seems to have done the trick. I still don't know from which mod the file came from or the nature of the incompatibility, but at this point, who cares?
Anyway, thanks to everyone in this thread for the help!