Mod Problems

So I downloaded a few mods today and before starting a new patrol enabled them (Merhchant fleet just to name one) and I found out it always crashes when I load patrols HOWEVER when I go back to the original set up it loads fine, now could this be because of corrupt files or what?? Im going to go through enabling and disabling mods here in a bit to see what ones specifically cause the problem. Id really like some help with this one and the depth charge problem ive been having (not being able to see the explosions, same with torps, underwater) I think I might just do a whole new reinstall of the game and mods. which saddens me cuz Im quite attatched to my Kaleun