Yah, actually I have this problem too for 48 hours now I think. It must be it, a connection problem with the psn servers on the Playstation. Tomorrow if it's still not fixed, I'll try calling Sony but it's my first time having problems with the ps3, never had any before. I've done everything that could possibly be the reason that caused this, but I see here I'm not the only one so...
Anyhow, let me know if you guys found anything

P.S : Noticed the PS store and doesn't work either so....