I had the same Problem until yesterday.
What i did:
1. Install BDEMU2 its for Multiman
2. Change the BD-Emulator Type to Hermes
3. Ereased all the 3D Movie Files (about 10GB)
4. Copied Unch3 with Multiman to external HDD - (Multiman will do everything for and copy the big .psarc File to the internal HDD from PS3
5. Start Multiman, go to Game Settings, hit the Option - external Game Data or something like that.
6. Start the Game and it should start the Game, it worked for me, only thing i didnt tried is the "Journal Freeze", i already patched all Files but did not try already.
Hope you understand everthing and this will solve your Problem.
Sorry for my English, isnt my Mother Language!