I've been poking around in all the SH4 files.
There are so many references to Uboat, Flotilla, VII, VIIc, UBoat aces, and more that I can't help but think that the game is just really SH3 with a new map and textures. Sorry, but its so bad, I went back to make sure I was looking at the right directory.
The fact that many of the problems we are reporting are exactly the same as SH3, I think this sim could have come out last year as an ADD-ON to SH3 and not a new sim.
I love the sim, please understand, but its really is just built on top of SH3. Texture files, and more say the same name even....