Hi, maybe this is a noob problem because i'm getting the exact same problem in both my ps3. In one i have 3.41 OFW and in the other one have 3.55 CFW kmeaw.
With recent games like AC Brotherhood, Mortal Kombat, Top Spin 4, etc, when I use the last MultiMan it gives black screen when I enter in PS3 Game menu and with Gaia Manager it gives an error.
Btw, both my consoles have the blu-ray broken so I can't put any disc. Is there any way I can play these games with a broken blu-ray? I think that in earlier versions of multiman there was the discless option... that is not present anymore??