Dang it, of course I forgot the patch
.
Ignore me, I need to bang my head on a wall some more.
Update: It appears the patch also had no effect. Two other things are also that I get a CTD whenever I try to open up the museum, and when I begin Pacific Campaigns I get two message boxes, one after I close the other. The first one simply states unknown error, the second states a path to the volumetric fog file.
Double Update: I currently have Stock SH4 with a amazon downloaded U-Boat addon, I recently reinstalled it and removed all mods that were still there (FOTRS, Subnuclear Deck Gun, Subnuclear Mk 14 and Cutie).
Triple Update: I did a fresh uninstallation of the mod and reinstallation. Museum still crashes and I still get the error when I enter campaigns, but the sub's texture was fine. However, this may very well have been because I picked a Narwhal-class submarine instead of a Gar-class.