[THEBERBSTER]

Hi k
I think it would be a good idea for you to run through my tutorials.
I do not think this is a compatibility issue although I have entered some dialogue below for you to look at.

LSH3 and SH3 in general do not like Windows 10 so you should run your game in Windows 7 compatibility mode.
It is also important to run your applications (.exe) as administrators.
If your system has recently updated to Windows 10 Creator version 1703 you also might need to tick the box to 'Override High DPI scaling,' this also can be found by opening the compatibility tab.

I think your problem is something you have either done, or not done that is the issue here.
When starting LSH3-2015 for the first time, Naval Academy, and then the Eprobungstelle test mission, and then transferring it has a set set of procedures that must be carried out in the right order, something you do not find with other SH3 variants.
Peter