Citadel DLC. Cant find/meet with several crew members.

Hello

Im playing the Citadel DLC, in the part between the clone's ending and the party. I got mails from my LI and 3 or 4 more characters, Met with them all. But after that Im missing people like Joker, Wrex, Jack, Steve, Vega...

I know some dont send message, Ive looked in every spot in the silversun strip, casino, bar, no sign from Wrex or anyone.  Ive reached the 9999 points in the Arena, and no message from Jack,

I think ive done everything right, and i cant meet with the rest of my crew, I even got back to the normandy, flew away and got back to the citadel.

Nothing.

Any help would be appreciated. Thanks.