Are you using
MultiSH3 for a new, unique Save folder for SH3, or did you delete the old data in the original one (C:\Users \UserName \Documents \SH3)? I am almost certain you have some mod conflicts with what you are trying to do, but you will have to wait for more authoritative help in that regard... I am basically a noob when it comes to SH3 mod lists, and I use the KISS principle, since I are the 2nd "S" in that acronym...
