The Museum is a HOSS! Don't go so fast through the listing of course, but that is one of our many tools for finding trouble in the mod. One thing you can do is check the SH4.exe file itself. Navigate into the game folder, and find the SH4.exe file, right-click on it, and choose "Properties" at the bottom of the resultant list. That will open the Properties page to the "General" tab. Toward the bottom of that tab is the "Attributes" section, and under it is a tick-box for "Read-only". That has to be empty. If it's not, clear it and "OK" your way out, and then do LAA again, or use
NTCore's 4Gig Patch. They both accomplish the same thing, but the SH4.exe has to be "write-able". Next up would be a question: "Did you empty the Save folder after activating the FotRSU mod, or use MultiSH4 to create a new one?"... Does the game take about 2 minutes or less to load, and then the Museum about 3.4 to 4 minutes to load and display?