(NOOB) MultiMan 1.15 black-screening on MW2 and Black Ops

Hey guys im a noob and i installed kmeaw cfw 3.55 with multiman 1.15 using the instructions by this site. i then proceeded to backup MW2 and black ops. i tried launching both games but they both black screen and my ps3 freezes. i then installed the lv2v6 and the fix permission pkg, ran them both before running MM and then i tried launching the games but now they just boot back to the xmb. I also tried the (select)+(x) trick but that didnt work either. Any help or advice? Noob in great need...LOL. Forgot to add that i have a PS3 Slim 250GB.