[Graf_Kacper]

Originally Posted by propbeanie

It is not recommended to use add-in mods not specifically written for FotRSU, the reason being that there are quite a few different "calls" to the equipment, ships & sub in the mod, as compared to stock and most other mods. The PSM would probably function OK, if all it does is change the Data / Sounds folder, but NOT the SH.SDL file. Same with the Real GSM, but if either chnages anything other than the sound files, you can run into issues. One aspect of the game and mods that affect all sorts of issues is where you have the game itself installed. If you are in either of the "Program Files" folders, the game will not update properly when mods are activated. You should be in a folder you created yourself, such as "C:\Games \Silent Hunter 4..." or whatever you want to call it. You also cannot be playing several different modded games at the same time, unless you are using MultiSH4 to have separate Save folders for each modded copy of the game. If you add mods to the game, or remove mods from the game, you will also sometimes run afoul of the Save folder not being properly initialized with the changes. You have to empty the Save folder between mod sets to clear the old data. This does preclude being able to re-use old Saved games. I do not have either of those mods myself, but inspect them yourself, and if there are other files besides wave files for the Sounds folder, or ogg files for the numbered files below that (Speech), then you might be running into issues with a gun change, or SH.SDL file change. You can refer to the pdf files in the FotRSU mod's Support folder for more information on installation of the game, as well as mod activations, and it all applies to 99.9% of other mods as well.

Aha! Eureka! Thanks for the tip about SH.SDL file, this was the culprit. Thank you!