My setup: PS3 fat (80gb), latest MM and Kmeaw 3.55.
This is what I tried (with DUPLEX release):
1. FTP over
2. Apply pkg
3. Copy sfo over
Trying to load internally and with disc continues to show a black screen that I can get out of. The DUPLEX release notes copying an eboot around from Super SF4, but everyone else has this working so easily I'm trying to figure out what I'm missing. Plenty of other titles on my 500gb drive and all of them were similar (ftp over, some pkg, etc).
Why don't you try copying the SFO over first, then apply the .pkg. That's what I did and it worked immediately. I didn't update either with Multiman, some said it worked but I didn't need to.
Glad you got it working. It's a pretty fun game actually. I miss the old 2D "beat em ups" Good game to play "winner stay on" with a bunch of friends and a few beers!