If the problem started after the latest patch/update, always make sure to update your mods when you update your game.Remember that you can possible have several broken mods.
If your problem occurred after a certain mod haul, remove all these new mods (see if the game works), and then add back a few at a time, restarting the game in between until you see the problem occurring again.
If that works but you want to keep your mods, you can try some different things to sort out the ones not working:
