Like james_nix says, give us your mod list. The easiest way to do that is to use JSGME to generate one for you, send it to the clipboard, and then paste into your next post.
It almost sounds like you have a partially activated mod. Another thing that we'd like to know is which folder you installed Silent Hunter into? Since you have the Uboats, you have v1.5, which is the "latest", but if you're in "C:\Program Files\" with the install, which is the "default..." location, you'll have to either move the install (if it's not a Steam install), or do some fancy Steam finagling if that's what you have - which I'll go look for some posts on moving a Steam install. THEBERBSTER has links in his signature, if you see any of his posts... what happens with the "C:\Program Files\" folder is that Windows "protects" the folder from alteration, without proper Windows User Access Control authority, which most of us mere mortals do not have, so it's easier to just move the install into a folder that you create off of the "root" of the drive, such as "C:\Games\", or whatever you want...
Edit: Missed ya! don't do OM until you figure out why TMO didn't work...
