Sudden Strange Visual Bug

[M.H.Corbett]

Greetings, Salutations,

Ive come looking for some help, because I’ve gotten SH4 on my pc perfectly before, but after I installed the u-boat add on and booted it up, it doesn’t run right. The game starts fine, and i can access the menus, start a campaign, and the cutscenes run, but trying to enter normal gameplay or the museum results in the game’s UI appearing over a black screen, I’ve reinstalled the game and messed sith my monitor settings but im at an impact, any insight on this?