"Unable to Play" message only on ONE user name

So, i keep getting the ‘unable to play’ message without even asking to search again on my main psn name. But then when I tried my roommate’s, it worked just fine. The settings all seem the same in terms of network connection and such. I can connect to everything/other games with my main name, but i can’t join SFIV games. The games even show up. Anyone know any sort of solution behind this? It means there’s not a router problem if it’s a matter of changing user names/psn names. I’m pretty confused by this and am trying to figure it out. Ugh. Any help would be appreciated. thanks.