When I've had mod problems, what I do is, starting from the latest install, deactivate about 5 at a time, go back into the game and check things out. Process of elimination until I find the mod that has caused me problems. It may be solved right away, or you may end up deactivating 30 mods before you find which one is causing the problem. Sometimes you do not see how some mods have done weird things until you get to the place it effects. I've had problems with somebody copying an NPC and putting them in their mod and something was not done right, so it affects the original NPC.