wnfl882 You could have a conflict between two mods, or you could have a mod that only creates a problem in some situations.
For a conflict, do the 50/50 method again to find one of the mods that isn't working. But you can't test each half/quarter/etc. separately; you need to test them together so you see the evidence of the conflict, then narrow things down to one of the mods that's a problem. You're looking for a mod that, when added to the other mods in place, makes the game stop working; but removing only that mod makes the game work fine again. Once you find that one, test your other mods against it—leave that one mod in place and 50/50 the rest to find the one it conflicts with.
If the problem is a single mod, but only in certain contexts, figure out what those contexts are, then test your mods in that specific context until you find the culprit.
Regardless of the exact nature of the problem, you've established pretty well that the cause is something in your Mods folder.