SaveMGO - MGO2

[Dirty Duck]

Hi, I need some help with SaveMGO on my PS3.
PS3 Slim CECH-3004A
System Software 4.85
PS3HEN enabled successfully
Original MGS4 disc
I installed SAVEMGO Launcher, GAMEDATA Part 1 and GAMEDATA Part 2.
The SAVEMGO launcher works and Check Files successfully checks all 1471 files without any errors.
However, every time I select Start Game, the screen goes completely black and the PS3 freezes. The HDD activity light also stops blinking.
I tested MGO through my original MGS4 disc. MGO Ver. 1.00 starts successfully and reaches the title screen.
So MGO itself works, HEN works, and all 1471 SAVEMGO files pass the check. Only launching through SAVEMGO causes the black screen.
Does anyone know how to fix this on a CECH-3004A with HEN 4.85?

Maybe PM @Kimidaki, they're the resident professional when it comes to setting SaveMGO up.